To reproduce:
- load two images and create a segmentation on each one
- make sure both images and segmentation are visible (checkboxes checked)
- change the segmentation combo box to the "wrong" segmentation
- you will see the message "Please perform a reinit on the segmentation image!"
- reinit the segmentation image
- the warning disappears and the tools are enabled
--> we now have a wrong "Patient Image - Segmentation"-pair set in the combo boxes