Ok, that sounds fine. Thank you! Peter

Hey Christian, I am having exactly the same problem. I use a SplitContainer and and have placed a TreeView control inside. In the right side of the split container, one of five different Forms shall be loaded, depending on what's selected in the TreeView. Up to now, I unfortunately have not found a solution, but I'm new to C#, so this does not mean anything ;-) "SubForms" even work in LabVIEW, so I would be very amazed, if C# would be unable to do the same... Peter