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DesktopContainer has no CancelClosing event

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Hi all
A DesktopContainer can be embedded into a window.
But it can be displayed without a window (myContainer.Show, or ShowModal or ShowPopover).
That’s great but… it has no CancelClosing event.
This kind of event is useful for example to save data from UIcontrols.
The Closing event fires but too late : the window has been emptied of its content.

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