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How to handle event when the close button of WinForms TabbedMDIManager child form is clicked?
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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)