diff --git a/Modules/QtWidgets/include/QmitkMxNMultiWidget.h b/Modules/QtWidgets/include/QmitkMxNMultiWidget.h
index b29129b28b..f96c90597f 100644
--- a/Modules/QtWidgets/include/QmitkMxNMultiWidget.h
+++ b/Modules/QtWidgets/include/QmitkMxNMultiWidget.h
@@ -1,119 +1,119 @@
 /*============================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center (DKFZ)
 All rights reserved.
 
 Use of this source code is governed by a 3-clause BSD license that can be
 found in the LICENSE file.
 
 ============================================================================*/
 
 #ifndef QMITKMXNMULTIWIDGET_H
 #define QMITKMXNMULTIWIDGET_H
 
 // qt widgets module
 #include "MitkQtWidgetsExports.h"
 #include "QmitkAbstractMultiWidget.h"
 
 #include <nlohmann/json.hpp>
 
 class QSplitter;
 
 /**
 * @brief The 'QmitkMxNMultiWidget' is a 'QmitkAbstractMultiWidget' that is used to display multiple render windows at once.
 *        Render windows can dynamically be added and removed to change the layout of the multi widget. This
 *        is done by using the 'SetLayout'-function to define a layout. This will automatically add or remove
 *        the appropriate number of render window widgets.
 */
 class MITKQTWIDGETS_EXPORT QmitkMxNMultiWidget : public QmitkAbstractMultiWidget
 {
   Q_OBJECT
 
 public:
 
   QmitkMxNMultiWidget(QWidget* parent = nullptr,
                       Qt::WindowFlags f = 0,
                       const QString& multiWidgetName = "mxnmulti");
 
   ~QmitkMxNMultiWidget();
 
   void InitializeMultiWidget() override;
 
   void Synchronize(bool synchronized) override;
 
   QmitkRenderWindow* GetRenderWindow(const QString& widgetName) const override;
   QmitkRenderWindow* GetRenderWindow(const mitk::AnatomicalPlane& orientation) const override;
 
   void SetActiveRenderWindowWidget(RenderWindowWidgetPointer activeRenderWindowWidget) override;
   /**
    * @brief Set the reference geometry for interaction inside the active render windows of the MxNMultiWidget.
    *
    * @param referenceGeometry   The reference geometry which is used for updating the
    *                            time geometry inside the active render window.
    * @param resetCamera         If true, the camera and crosshair will be reset to the default view (centered, no zoom).
    *                            If false, the current crosshair position and the camera zoom will be stored and reset
    *                            after the reference geometry has been updated.
    */
   void SetReferenceGeometry(const mitk::TimeGeometry* referenceGeometry, bool resetCamera) override;
 
   /**
   * @brief Returns true if the render windows are coupled; false if not.
   *
   * For the MxNMultiWidget the render windows are typically decoupled.
   */
   bool HasCoupledRenderWindows() const override;
 
   void SetSelectedPosition(const mitk::Point3D& newPosition, const QString& widgetName) override;
   const mitk::Point3D GetSelectedPosition(const QString& widgetName) const override;
 
   void SetCrosshairVisibility(bool visible) override;
   bool GetCrosshairVisibility() const override;
   void SetCrosshairGap(unsigned int gapSize) override;
 
   void ResetCrosshair() override;
 
   void SetWidgetPlaneMode(int userMode) override;
 
   mitk::SliceNavigationController* GetTimeNavigationController();
 
   void AddPlanesToDataStorage();
   void RemovePlanesFromDataStorage();
 
 public Q_SLOTS:
 
   // mouse events
   void wheelEvent(QWheelEvent* e) override;
   void mousePressEvent(QMouseEvent* e) override;
   void moveEvent(QMoveEvent* e) override;
   void LoadCustomLayout(std::string filename);
   void LoadPresetLayout(std::string filename);
   void LoadLayout(nlohmann::json data);
   void SaveLayout(std::string filename);
 
 Q_SIGNALS:
 
   void WheelMoved(QWheelEvent *);
   void Moved();
 
 protected:
 
   void RemoveRenderWindowWidget() override;
 
 private:
 
   void SetLayoutImpl() override;
   void SetInteractionSchemeImpl() override { }
 
   void CreateRenderWindowWidget();
   nlohmann::json BuildJSONFromLayout(QSplitter* splitter);
-  QSplitter* BuildLayoutFromJSON(nlohmann::json jsonData, int* windowCounter, QSplitter* parentSplitter = nullptr);
+  QSplitter* BuildLayoutFromJSON(nlohmann::json jsonData, unsigned int* windowCounter, QSplitter* parentSplitter = nullptr);
 
   mitk::SliceNavigationController* m_TimeNavigationController;
 
   bool m_CrosshairVisibility;
 
 };
 
 #endif // QMITKMXNMULTIWIDGET_H
diff --git a/Modules/QtWidgets/src/QmitkMxNMultiWidget.cpp b/Modules/QtWidgets/src/QmitkMxNMultiWidget.cpp
index 8ceae7fd29..3da7e338a8 100644
--- a/Modules/QtWidgets/src/QmitkMxNMultiWidget.cpp
+++ b/Modules/QtWidgets/src/QmitkMxNMultiWidget.cpp
@@ -1,563 +1,563 @@
 /*============================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center (DKFZ)
 All rights reserved.
 
 Use of this source code is governed by a 3-clause BSD license that can be
 found in the LICENSE file.
 
 ============================================================================*/
 
 #include "QmitkMxNMultiWidget.h"
 #include "QmitkRenderWindowWidget.h"
 
 // mitk core
 #include <mitkDisplayActionEventFunctions.h>
 #include <mitkDisplayActionEventHandlerDesynchronized.h>
 #include <mitkDisplayActionEventHandlerSynchronized.h>
 
 // qt
 #include <QGridLayout>
 #include <QMessageBox>
 #include <QSplitter>
 
 #include <usGetModuleContext.h>
 #include <usModuleContext.h>
 #include <usModuleResource.h>
 #include <usModuleResourceStream.h>
 
 #include <fstream>
 
 QmitkMxNMultiWidget::QmitkMxNMultiWidget(QWidget* parent,
                                          Qt::WindowFlags f/* = 0*/,
                                          const QString& multiWidgetName/* = "mxnmulti"*/)
   : QmitkAbstractMultiWidget(parent, f, multiWidgetName)
   , m_TimeNavigationController(nullptr)
   , m_CrosshairVisibility(false)
 {
   m_TimeNavigationController = mitk::RenderingManager::GetInstance()->GetTimeNavigationController();
 }
 
 QmitkMxNMultiWidget::~QmitkMxNMultiWidget()
 {
   auto allRenderWindows = this->GetRenderWindows();
   for (auto& renderWindow : allRenderWindows)
   {
     m_TimeNavigationController->Disconnect(renderWindow->GetSliceNavigationController());
   }
 }
 
 void QmitkMxNMultiWidget::InitializeMultiWidget()
 {
   SetLayout(1, 1);
   SetDisplayActionEventHandler(std::make_unique<mitk::DisplayActionEventHandlerDesynchronized>());
   auto displayActionEventHandler = GetDisplayActionEventHandler();
   if (nullptr != displayActionEventHandler)
   {
     displayActionEventHandler->InitActions();
   }
 }
 
 void QmitkMxNMultiWidget::Synchronize(bool synchronized)
 {
   if (synchronized)
   {
     SetDisplayActionEventHandler(std::make_unique<mitk::DisplayActionEventHandlerSynchronized>());
   }
   else
   {
     SetDisplayActionEventHandler(std::make_unique<mitk::DisplayActionEventHandlerDesynchronized>());
   }
 
   auto displayActionEventHandler = GetDisplayActionEventHandler();
   if (nullptr != displayActionEventHandler)
   {
     displayActionEventHandler->InitActions();
   }
 }
 
 QmitkRenderWindow* QmitkMxNMultiWidget::GetRenderWindow(const QString& widgetName) const
 {
   if ("axial" == widgetName || "sagittal" == widgetName || "coronal" == widgetName || "3d" == widgetName)
   {
     return GetActiveRenderWindowWidget()->GetRenderWindow();
   }
 
   return QmitkAbstractMultiWidget::GetRenderWindow(widgetName);
 }
 
 QmitkRenderWindow* QmitkMxNMultiWidget::GetRenderWindow(const mitk::AnatomicalPlane& /*orientation*/) const
 {
   // currently no mapping between plane orientation and render windows
   // simply return the currently active render window
   return GetActiveRenderWindowWidget()->GetRenderWindow();
 }
 
 void QmitkMxNMultiWidget::SetActiveRenderWindowWidget(RenderWindowWidgetPointer activeRenderWindowWidget)
 {
   auto currentActiveRenderWindowWidget = GetActiveRenderWindowWidget();
   if (currentActiveRenderWindowWidget == activeRenderWindowWidget)
   {
     return;
   }
 
   // reset the decoration color of the previously active render window widget
   if (nullptr != currentActiveRenderWindowWidget)
   {
     auto decorationColor = currentActiveRenderWindowWidget->GetDecorationColor();
     QColor hexColor(decorationColor[0] * 255, decorationColor[1] * 255, decorationColor[2] * 255);
     currentActiveRenderWindowWidget->setStyleSheet("QmitkRenderWindowWidget { border: 2px solid " +
                                                    hexColor.name(QColor::HexRgb) + "; }");
   }
 
   // set the new decoration color of the currently active render window widget
   if (nullptr != activeRenderWindowWidget)
   {
     activeRenderWindowWidget->setStyleSheet("QmitkRenderWindowWidget { border: 2px solid #FF6464; }");
   }
 
   QmitkAbstractMultiWidget::SetActiveRenderWindowWidget(activeRenderWindowWidget);
 }
 
 void QmitkMxNMultiWidget::SetReferenceGeometry(const mitk::TimeGeometry* referenceGeometry, bool resetCamera)
 {
   auto* renderingManager = mitk::RenderingManager::GetInstance();
   mitk::Point3D currentPosition = mitk::Point3D();
   unsigned int imageTimeStep = 0;
   if (!resetCamera)
   {
     // store the current position to set it again later, if the camera should not be reset
     currentPosition = this->GetSelectedPosition("");
 
     // store the current time step to set it again later, if the camera should not be reset
     const auto currentTimePoint = renderingManager->GetTimeNavigationController()->GetSelectedTimePoint();
     if (referenceGeometry->IsValidTimePoint(currentTimePoint))
     {
       imageTimeStep = referenceGeometry->TimePointToTimeStep(currentTimePoint);
     }
   }
 
   // initialize active render window
   renderingManager->InitializeView(
     this->GetActiveRenderWindowWidget()->GetRenderWindow()->GetVtkRenderWindow(), referenceGeometry, resetCamera);
 
   if (!resetCamera)
   {
     this->SetSelectedPosition(currentPosition, "");
     renderingManager->GetTimeNavigationController()->GetTime()->SetPos(imageTimeStep);
   }
 }
 
 bool QmitkMxNMultiWidget::HasCoupledRenderWindows() const
 {
   return false;
 }
 
 void QmitkMxNMultiWidget::SetSelectedPosition(const mitk::Point3D& newPosition, const QString& widgetName)
 {
   RenderWindowWidgetPointer renderWindowWidget;
   if (widgetName.isNull() || widgetName.isEmpty())
   {
     renderWindowWidget = GetActiveRenderWindowWidget();
   }
   else
   {
     renderWindowWidget = GetRenderWindowWidget(widgetName);
   }
 
   if (nullptr != renderWindowWidget)
   {
     renderWindowWidget->GetSliceNavigationController()->SelectSliceByPoint(newPosition);
     return;
   }
 
   MITK_ERROR << "Position can not be set for an unknown render window widget.";
 }
 
 const mitk::Point3D QmitkMxNMultiWidget::GetSelectedPosition(const QString& widgetName) const
 {
   RenderWindowWidgetPointer renderWindowWidget;
   if (widgetName.isNull() || widgetName.isEmpty())
   {
     renderWindowWidget = GetActiveRenderWindowWidget();
   }
   else
   {
     renderWindowWidget = GetRenderWindowWidget(widgetName);
   }
 
   if (nullptr != renderWindowWidget)
   {
     return renderWindowWidget->GetCrosshairPosition();
   }
 
   MITK_ERROR << "Crosshair position can not be retrieved.";
   return mitk::Point3D(0.0);
 }
 
 void QmitkMxNMultiWidget::SetCrosshairVisibility(bool visible)
 {
   // get the specific render window that sent the signal
   QmitkRenderWindow* renderWindow = qobject_cast<QmitkRenderWindow*>(sender());
   if (nullptr == renderWindow)
   {
     return;
   }
 
   auto renderWindowWidget = this->GetRenderWindowWidget(renderWindow);
   renderWindowWidget->SetCrosshairVisibility(visible);
 }
 
 bool QmitkMxNMultiWidget::GetCrosshairVisibility() const
 {
   // get the specific render window that sent the signal
   QmitkRenderWindow* renderWindow = qobject_cast<QmitkRenderWindow*>(sender());
   if (nullptr == renderWindow)
   {
     return false;
   }
 
   auto renderWindowWidget = this->GetRenderWindowWidget(renderWindow);
   return renderWindowWidget->GetCrosshairVisibility();
 }
 
 void QmitkMxNMultiWidget::SetCrosshairGap(unsigned int gapSize)
 {
   auto renderWindowWidgets = this->GetRenderWindowWidgets();
   for (const auto& renderWindowWidget : renderWindowWidgets)
   {
     renderWindowWidget.second->SetCrosshairGap(gapSize);
   }
 }
 
 void QmitkMxNMultiWidget::ResetCrosshair()
 {
   auto dataStorage = GetDataStorage();
   if (nullptr == dataStorage)
   {
     return;
   }
 
   // get the specific render window that sent the signal
   QmitkRenderWindow* renderWindow = qobject_cast<QmitkRenderWindow*>(sender());
   if (nullptr == renderWindow)
   {
     return;
   }
 
   mitk::RenderingManager::GetInstance()->InitializeViewByBoundingObjects(renderWindow->GetRenderWindow(), dataStorage);
 
   SetWidgetPlaneMode(mitk::InteractionSchemeSwitcher::MITKStandard);
 }
 
 void QmitkMxNMultiWidget::SetWidgetPlaneMode(int userMode)
 {
   MITK_DEBUG << "Changing crosshair mode to " << userMode;
 
   switch (userMode)
   {
     case 0:
       SetInteractionScheme(mitk::InteractionSchemeSwitcher::MITKStandard);
       break;
     case 1:
       SetInteractionScheme(mitk::InteractionSchemeSwitcher::MITKRotationUncoupled);
       break;
     case 2:
       SetInteractionScheme(mitk::InteractionSchemeSwitcher::MITKRotationCoupled);
       break;
     case 3:
       SetInteractionScheme(mitk::InteractionSchemeSwitcher::MITKSwivel);
       break;
   }
 }
 
 mitk::SliceNavigationController* QmitkMxNMultiWidget::GetTimeNavigationController()
 {
   return m_TimeNavigationController;
 }
 
 void QmitkMxNMultiWidget::AddPlanesToDataStorage()
 {
   auto renderWindowWidgets = this->GetRenderWindowWidgets();
   for (const auto& renderWindowWidget : renderWindowWidgets)
   {
     renderWindowWidget.second->AddPlanesToDataStorage();
   }
 }
 
 void QmitkMxNMultiWidget::RemovePlanesFromDataStorage()
 {
   auto renderWindowWidgets = this->GetRenderWindowWidgets();
   for (const auto& renderWindowWidget : renderWindowWidgets)
   {
     renderWindowWidget.second->RemovePlanesFromDataStorage();
   }
 }
 
 //////////////////////////////////////////////////////////////////////////
 // PUBLIC SLOTS
 // MOUSE EVENTS
 //////////////////////////////////////////////////////////////////////////
 void QmitkMxNMultiWidget::wheelEvent(QWheelEvent* e)
 {
   emit WheelMoved(e);
 }
 
 void QmitkMxNMultiWidget::mousePressEvent(QMouseEvent*)
 {
   // nothing here, but necessary for mouse interactions (.xml-configuration files)
 }
 
 void QmitkMxNMultiWidget::moveEvent(QMoveEvent* e)
 {
   QWidget::moveEvent(e);
 
   // it is necessary to readjust the position of the overlays as the MultiWidget has moved
   // unfortunately it's not done by QmitkRenderWindow::moveEvent -> must be done here
   emit Moved();
 }
 
 void QmitkMxNMultiWidget::RemoveRenderWindowWidget()
 {
   auto renderWindowWidgets = this->GetRenderWindowWidgets();
   auto iterator = renderWindowWidgets.find(this->GetNameFromIndex(this->GetNumberOfRenderWindowWidgets() - 1));
   if (iterator == renderWindowWidgets.end())
   {
     return;
   }
 
   // disconnect each signal of this render window widget
   RenderWindowWidgetPointer renderWindowWidgetToRemove = iterator->second;
   m_TimeNavigationController->Disconnect(renderWindowWidgetToRemove->GetSliceNavigationController());
 
   QmitkAbstractMultiWidget::RemoveRenderWindowWidget();
 }
 
 //////////////////////////////////////////////////////////////////////////
 // PRIVATE
 //////////////////////////////////////////////////////////////////////////
 void QmitkMxNMultiWidget::SetLayoutImpl()
 {
   int requiredRenderWindowWidgets = GetRowCount() * GetColumnCount();
   int existingRenderWindowWidgets = GetRenderWindowWidgets().size();
 
   int difference = requiredRenderWindowWidgets - existingRenderWindowWidgets;
   while (0 < difference)
   {
     // more render window widgets needed
     CreateRenderWindowWidget();
     --difference;
   }
 
   while (0 > difference)
   {
     // less render window widgets needed
     RemoveRenderWindowWidget();
     ++difference;
   }
 
   auto firstRenderWindowWidget = GetFirstRenderWindowWidget();
   if (nullptr != firstRenderWindowWidget)
   {
     SetActiveRenderWindowWidget(firstRenderWindowWidget);
   }
 
   GetMultiWidgetLayoutManager()->SetLayoutDesign(QmitkMultiWidgetLayoutManager::LayoutDesign::DEFAULT);
 }
 
 void QmitkMxNMultiWidget::CreateRenderWindowWidget()
 {
   // create the render window widget and connect signal / slot
   QString renderWindowWidgetName = GetNameFromIndex(GetNumberOfRenderWindowWidgets());
   RenderWindowWidgetPointer renderWindowWidget = std::make_shared<QmitkRenderWindowWidget>(this, renderWindowWidgetName, GetDataStorage(), true);
   renderWindowWidget->SetCornerAnnotationText(renderWindowWidgetName.toStdString());
   AddRenderWindowWidget(renderWindowWidgetName, renderWindowWidget);
 
   auto renderWindow = renderWindowWidget->GetRenderWindow();
   auto layoutManager = GetMultiWidgetLayoutManager();
   connect(renderWindow, &QmitkRenderWindow::LayoutDesignChanged, layoutManager, &QmitkMultiWidgetLayoutManager::SetLayoutDesign);
   connect(renderWindow, &QmitkRenderWindow::ResetView, this, &QmitkMxNMultiWidget::ResetCrosshair);
   connect(renderWindow, &QmitkRenderWindow::CrosshairVisibilityChanged, this, &QmitkMxNMultiWidget::SetCrosshairVisibility);
   connect(renderWindow, &QmitkRenderWindow::CrosshairRotationModeChanged, this, &QmitkMxNMultiWidget::SetWidgetPlaneMode);
 
   // connect time navigation controller to react on geometry time events with the render window's slice naviation controller
   m_TimeNavigationController->ConnectGeometryTimeEvent(renderWindow->GetSliceNavigationController());
   // reverse connection between the render window's slice navigation controller and the time navigation controller
   renderWindow->GetSliceNavigationController()->ConnectGeometryTimeEvent(m_TimeNavigationController);
 }
 
 void QmitkMxNMultiWidget::LoadCustomLayout(std::string filename)
 {
   if (filename.empty())
   {
     return;
   }
 
   std::ifstream f(filename);
   auto data = nlohmann::json::parse(f);
   LoadLayout(data);
 }
 
 void QmitkMxNMultiWidget::LoadPresetLayout(std::string filename)
 {
   auto jsonResource = us::GetModuleContext()->GetModule()->GetResource(filename);
   if (!jsonResource.IsValid() || !jsonResource.IsFile())
   {
     return;
   }
 
   us::ModuleResourceStream jsonStream(jsonResource);
   auto data = nlohmann::json::parse(jsonStream);
   LoadLayout(data);
 }
 
 void QmitkMxNMultiWidget::LoadLayout(nlohmann::json data)
 {
   if (data.is_null())
   {
     QMessageBox::warning(this, "Load layout", "Could not read window layout");
   }
 
   delete this->layout();
-  int windowCounter = 0;
+  unsigned int windowCounter = 0;
   auto content = BuildLayoutFromJSON(data, &windowCounter);
   auto hBoxLayout = new QHBoxLayout(this);
   this->setLayout(hBoxLayout);
   hBoxLayout->addWidget(content);
 
   while (GetNumberOfRenderWindowWidgets() > windowCounter)
   {
     RemoveRenderWindowWidget();
   }
 }
 
 void QmitkMxNMultiWidget::SaveLayout(std::string filename)
 {
   if (filename.empty())
     return;
 
   nlohmann::json layoutJSON;
   auto layout = this->layout();
   if (layout == nullptr)
     return;
 
   // There should only ever be one item: either a window or a splitter
   auto widget = layout->itemAt(0)->widget();
 
   if (auto splitter = dynamic_cast<QSplitter*>(widget); splitter)
   {
     layoutJSON = BuildJSONFromLayout(splitter);
   }
   else if (auto window = dynamic_cast<QmitkRenderWindowWidget*>(widget); window)
   {
     layoutJSON["isWindow"] = true;
   }
 
   std::ofstream outStream(filename);
   outStream << std::setw(4) << layoutJSON << std::endl;
 
 }
 
 nlohmann::json QmitkMxNMultiWidget::BuildJSONFromLayout(QSplitter* splitter)
 {
   nlohmann::json resultJSON;
   resultJSON["isWindow"] = false;
   resultJSON["vertical"] = (splitter->orientation() == Qt::Vertical) ? true : false;
   auto sizes = splitter->sizes();
 
   auto content = nlohmann::json::array();
 
   auto countSplitter = splitter->count();
   for (int i = 0; i < countSplitter; ++i)
   {
     auto widget = splitter->widget(i);
     nlohmann::json widgetJSON;
     if (auto widgetSplitter = dynamic_cast<QSplitter*>(widget); widgetSplitter)
     {
       widgetJSON = BuildJSONFromLayout(widgetSplitter);
     }
     else if (auto widgetWindow = dynamic_cast<QmitkRenderWindowWidget*>(widget); widgetWindow)
     {
       widgetJSON["isWindow"] = true;
       widgetJSON["viewDirection"] = widgetWindow->GetSliceNavigationController()->GetViewDirectionAsString();
     }
     widgetJSON["size"] = sizes[i];
     content.push_back(widgetJSON);
   }
   resultJSON["content"] = content;
   return resultJSON;
 }
 
-QSplitter* QmitkMxNMultiWidget::BuildLayoutFromJSON(nlohmann::json jsonData, int* windowCounter, QSplitter* parentSplitter)
+QSplitter* QmitkMxNMultiWidget::BuildLayoutFromJSON(nlohmann::json jsonData, unsigned int* windowCounter, QSplitter* parentSplitter)
 {
   bool vertical = jsonData["vertical"].get<bool>();
   auto orientation = vertical ? Qt::Vertical : Qt::Horizontal;
 
   auto split = new QSplitter(orientation, parentSplitter);
   QList<int> sizes;
 
   for (auto object : jsonData["content"])
   {
     bool isWindow = object["isWindow"].get<bool>();
     int size = object["size"].get<int>();
     sizes.append(size);
 
     if (isWindow)
     {
       auto viewDirection = object["viewDirection"].get<std::string>();
       mitk::AnatomicalPlane viewPlane = mitk::AnatomicalPlane::Sagittal;
       if (viewDirection == "Axial")
       {
         viewPlane = mitk::AnatomicalPlane::Axial;
       }
       else if (viewDirection == "Coronal")
       {
         viewPlane = mitk::AnatomicalPlane::Coronal;
       }
       else if (viewDirection == "Original")
       {
         viewPlane = mitk::AnatomicalPlane::Original;
       }
       else if (viewDirection == "Sagittal")
       {
         viewPlane = mitk::AnatomicalPlane::Sagittal;
       }
 
       QmitkAbstractMultiWidget::RenderWindowWidgetPointer window;
       QString renderWindowName;
       QmitkAbstractMultiWidget::RenderWindowWidgetMap::iterator it;
       if (*windowCounter < GetRenderWindowWidgets().size())
       {
         renderWindowName = this->GetNameFromIndex(*windowCounter);
       }
       else
       {
         CreateRenderWindowWidget();
         renderWindowName = this->GetNameFromIndex(this->GetNumberOfRenderWindowWidgets() - 1);
       }
       auto temp = renderWindowName.toStdString();
       auto renderWindowWidgets = GetRenderWindowWidgets();
       it = renderWindowWidgets.find(renderWindowName);
       if (it != renderWindowWidgets.end())
       {
         window = it->second;
         window->GetSliceNavigationController()->SetDefaultViewDirection(viewPlane);
         window->GetSliceNavigationController()->Update();
         split->addWidget(window.get());
         window->show();
         (*windowCounter)++;
       }
     }
     else
     {
       auto subSplitter = BuildLayoutFromJSON(object, windowCounter, split);
       split->addWidget(subSplitter);
     }
   }
   split->setSizes(sizes);
 
   return split;
 
 }