OS.gtk_widget_realize (parent.handle);
public void setWidth (int width) {	checkWidget();	if (width > 0) {		useFixedWidth = true;		OS.gtk_tree_view_column_set_fixed_width (handle, width);		OS.gtk_tree_view_column_set_visible (handle, true);	} else {		OS.gtk_tree_view_column_set_visible (handle, false);	}}