///////////// Unit1.h
class TForm1 : public TForm
{
__published:    // IDE-managed Components
private:    // User declarations
    void __fastcall ResetWindowPosition( void );
public:        // User declarations
    void __fastcall WmMove( TWMMove& Msg );
    __fastcall TForm1(TComponent* Owner);
    BEGIN_MESSAGE_MAP
        MESSAGE_HANDLER( WM_MOVE, TWMMove, WmMove )
    END_MESSAGE_MAP( TForm )
};

///////////// Unit1.cpp
void __fastcall TForm1::WmMove( TWMMove& Msg )
{
    ShowMessage("Move~~");
}