Processes the given message and returns some Boolean information based on the message's content.
function DesignWndProc(var Message: TMessage): Boolean; override;
virtual __fastcall Boolean DesignWndProc(TMessage Message);
DesignWndProc returns True if the csDesignInteractive option in ControlStyle is enabled and if either the right mouse button is pressed or the right mouse button is released. The True value is returned also when ControlStyle is enabled and when either the mouse had moved or the right mouse button is double-clicked.
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