code: func (v *TreeViewColumn) GetWidget() (*Widget, error) {
  	widget := C.gtk_tree_view_column_get_widget(v.native())
  	if widget == nil {
  		return nil, nilPtrErr
  	}
  	obj := glib.Take(unsafe.Pointer(widget))
  	return wrapWidget(obj), nil
  }
docs: // GetWidget() is a wrapper around gtk_tree_view_column_get_widget().