gtk/tree_view.go
func (v *TreeView) SetExpanderColumn(column *TreeViewColumn) {
	C.gtk_tree_view_set_expander_column(v.native(), column.native())
}
func (v *TreeView) SetExpanderColumn(column *TreeViewColumn) {
	C.gtk_tree_view_set_expander_column(v.native(), column.native())
}
// SetExpanderColumn is a wrapper around gtk_tree_view_set_expander_column().