and EVT_SPLITTER_SASH_POS_CHANGED events. In the case of _CHANGED
events, sets the the new sash position. In the case of _CHANGING
events, sets the new tracking bar position so visual feedback during
and EVT_SPLITTER_SASH_POS_CHANGED events. In the case of _CHANGED
events, sets the the new sash position. In the case of _CHANGING
events, sets the new tracking bar position so visual feedback during