Determines whether the COleControl object has the mouse capture.
CWnd* GetCapture( );
If the control is activated and windowless, returns this if the control currently has the mouse capture (as determined by the control's container), or NULL if it does not have the capture.
Otherwise, returns the CWnd object that has the mouse capture (same as CWnd::GetCapture).
An activated windowless control receives the mouse capture when SetCapture is called.