Releasing Instance Data Storage

       case WM_DESTROY:
            hFrame=WinQueryWindow(hwnd,
                                  QW_PARENT,
                                  FALSE);
            MyStruct=WinQueryWindowULong(hFrame,
                                         QWL_USER);
            <Release data objects>
            <Release Presentation Manager resources>
            DosFreeMem(MyStruct);
            return((MRESULT)0);
            break;
              :