enable/disable context menu entry

[dani]

Hi all

I have modified the visio ui object so I have a custom entry in my
context menu now.

How can I make that entry enabled when the user is right-clicking on a
shape, and disabled when right-clicking on the background?

I have tried to catch the SelectionChanged event, but this event seems
to be fired after the context menu is openend, so if there was no shape
selected, the entry will remain disabled when right-clicking on the shape.

any ideas?

Daniel