gtk/tree_view_column.go
func (v *TreeViewColumn) SetWidget(widget IWidget) {
	C.gtk_tree_view_column_set_widget(v.native(), widget.toWidget())
}
func (v *TreeViewColumn) SetWidget(widget IWidget) {
	C.gtk_tree_view_column_set_widget(v.native(), widget.toWidget())
}
// SetWidget() is a wrapper around gtk_tree_view_column_set_widget().