virtual void DoClientToScreen(int *x, int *y) const;
virtual void DoScreenToClient(int *x, int *y) const;
virtual void DoGetPosition(int *x, int *y) const;
virtual void DoClientToScreen(int *x, int *y) const;
virtual void DoScreenToClient(int *x, int *y) const;
virtual void DoGetPosition(int *x, int *y) const;