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How to handle event when the close button of WinForms TabbedMDIManager child form is clicked?
Handle the closing event
You can achieve this by handling FormClosing event of tabbedMDI child Form.
C#
tabbedForm.FormClosing += new FormClosingEventHandler(tabbedForm_FormClosing);
VB
tabbedForm.FormClosing += New FormClosingEventHandler(tabbedForm_FormClosing)