Wrong click position in TreeGrid

Hello,

following issue occurs using TreeGrid in Internet Explorer or Chrome. There is no problem in Firefox.

I use TreeGrid to draw a list of processes like this:

+MainProcess1
- SubProcess 1
- SubProcess 2
+MainProcess2
- SubProcess 3
- SubProcess 4
+MainProcess3
- SubProcess 5
- SubProcess 6

When I try to expand MainProcess2 by a mouse click MainProcess3 expands ?!

Does anybody ran in this issue before?

Thanks, René

(using SmartClient 10)