We have a .net 4.0 windows form ActiveX and we have to use it within a Windows Form .net 2.0 desktop application.
We wrapped the .net 4.0 ActiveX (.net4Ax) with an other activeX written using Delphi (DAx).
The Delphi Ax is then included within the .net 2.0 application.The activeX is positioned within an MDI child window.
The activeX seems working fine except for a strange behavior. When the .net4Ax is focused and the mouse goes over a button and a tooltip is shown, the MDI child window which contains the activex immedately dsappear. Just clicking somewher in the .net 2.0 application and the mdi child window is shown again.
If the focus is not to an element in the Activex the toolip is shown correctly and the mdi child window does not disapper.
The mdi child window disappear also if popup menu in the richtextbox (which is contained in the .net 4.0 activex) is shown clicking within the richtextbox with the right mouse button.
A windows form .net 2.0 test application has been created but the problem is not present.
This behavoir looks similar to this: http://social.msdn.microsoft.com/Forums/windows/en-US/e4479400-e8e7-4a84-8529-72ec7c1c5bf3/toolstripdropdown-odd-form-paint-behavior-bug?forum=winforms
Any help is really appreciated!
Thanks.