this );
widget.setHeaderWidget( header );
widget.setSidebarWidget( sidebar );
widget.setHasSystemControlledColumns( this );
widget.getGridWidget().addSelectedCellChangeHandler( new SelectedCellChangeHandler() {
public void onSelectedCellChange(SelectedCellChangeEvent event) {
CellValue< ? > cell = widget.getGridWidget().getData().get( event.getCellSelectionDetail().getCoordinate() );
dtableCtrls.getOtherwiseButton().setEnabled( canAcceptOtherwiseValues( cell ) );