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DesktopWindow.CancelClosing(appQuitting as Boolean) As Boolean

New in 2021r3

Supported for all project types and targets.

The window is about to be closed by the user clicking the close button, by calling the Quit or DesktopWindow.Close methods.


When the app is quitting, CancelClosing and Closing are called as a pair for each open window. Closing will be called after CancelClosing executes, assuming that the close wasn't canceled by the user.

Return True to prevent the window (and in the case of the Quit method, other open windows) from closing. The parameter appQuitting is True when the window is being closed because the whole app is quitting and False when only the window is being closed.

See Also