Capturing X closing event in IDE it self

[vemula.k]

hi,

i created addin project and added some Items to menubars like Project
menu, Tools Menu etc.
for these items i added some funtionality and i used user controls for
editing the items.

when i run this Project one more IDE will open. using addin project
template i created the project and
edit items then winow will open based on created user control and then
added some data to that window
then closing window without saving but it will not ask for saving.

is there any event for capturing closing event.
plz let me know that one.



thanks
koti