I have TabControls that Hold Forms on his TabPges (this make me easy
to give ability to Designing each form in his IDE window).
When form x is in middle of Edit Data Mode, I going to prevent:
Closing App or switch to other tabs until save done explicit by user.
So I try use events like:
deactivate,leave,lostfocus,formclosing,validating to prevent user
leave before save. but no one work:
the [deactivate,leave,lostfocus,formclosing] not fire at all when app
closing or switch to other tabs
the Validating fire, but when (there no change if i set e.cancel =
true or e.cancel = false) user switch to othet tab we got unexpected
behavior: the validating fire 3 times and switch to next tab, now the
validating fire again and again as respond to any click on App window!
this is bug?