How I get notified when the user has selected(or cancelled) an item in a CExtGridCellCheckListComboBox?

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The CExtGridCellCheckListComboBox has a virtual method named OnPopupListBoxItemClick() that is invoked each time the user changes the checked state (with the mouse or keyboard). So you can get notified about this by overriding this method in a CExtGridCellCheckListComboBox-derived class. Please note you should invoke the parent class�s method so the checked state can be changed properly.