This instance method is called to drag-apply a value in a cell.
#define INCL_WINWORKPLACE
#include <os2.h>
WPPalette *somSelf; /* Pointer to the object on which the method is being invoked. */
PCELL pCell; /* Pointer to the CELL structure to be dragged. */
HWND hwndPal; /* Palette window handle. */
PPOINTL ptlDrag; /* Pointer in hwndPal coordinates from which drag was initiated. */
BOOL rc; /* Success indicator. */
rc = _wpDragCell(somSelf, pCell, hwndPal,
ptlDrag);