gtk/tree_view.go
func (v *TreeView) InsertColumn(column *TreeViewColumn, pos int) int {
	return int(C.gtk_tree_view_insert_column(v.native(), column.native(), C.gint(pos)))
}
func (v *TreeView) InsertColumn(column *TreeViewColumn, pos int) int {
	return int(C.gtk_tree_view_insert_column(v.native(), column.native(), C.gint(pos)))
}
// InsertColumn is a wrapper around gtk_tree_view_insert_column().