if (handle == 0) error (SWT.ERROR_NO_HANDLES);
if (handle == 0) SWT.error (SWT.ERROR_NO_HANDLES); OS.GTK_WIDGET_SET_FLAGS(handle, OS.GTK_CAN_FOCUS);
void createHandle (int index) {	state |= HANDLE;	fixedHandle = OS.gtk_fixed_new ();	if (fixedHandle == 0) error (SWT.ERROR_NO_HANDLES);	scrolledHandle = OS.gtk_scrolled_window_new (0, 0);	if (scrolledHandle == 0) error (SWT.ERROR_NO_HANDLES);	handle = OS.gtk_ctree_new (1, 0);	if (handle == 0) error (SWT.ERROR_NO_HANDLES);	if ((style & SWT.CHECK) != 0) {		/*		* This code is intentionally commented.  At this		* point, the item height has not been set for the		* widget so guess at a good width and height for		* the checked an unchecked images.		*///		GtkCList clist = new GtkCList ();//		OS.memmove (clist, handle, GtkCList.sizeof);//		int height = clist.row_height + 1, width = height;		int width = CHECK_WIDTH, height = CHECK_HEIGHT;		int style = OS.gtk_widget_get_style (handle);		Display display = getDisplay ();		uncheck = new Image (display, width, height);		OS.gtk_draw_check (style, uncheck.pixmap, OS.GTK_STATE_NORMAL, OS.GTK_SHADOW_OUT, 0, 0, width, height);		check = new Image (display, width, height);		OS.gtk_draw_check (style, check.pixmap, OS.GTK_STATE_NORMAL, OS.GTK_SHADOW_IN, 0, 0, width, height);	}}