procedure MouseMove(Shift: TShiftState; X, Y: Integer); dynamic;
DYNAMIC void __fastcall MouseMove(System::Classes::TShiftState Shift, int X, int Y);
Responds to mouse moving over control area.
A control calls MouseMove in response to any of the Windows mouse-move messages (WM_MOUSEMOVE), decoding the message parameters into the shift-key state and position, which it passes in the Shift, X, and Y parameters, respectively.
As the mouse cursor moves across a control, this method is called repeatedly. Each time it is called, it is with the new coordinates that reflect the continuous path of the mouse cursor across the screen real estate covered by the control's visual representation.