gtk/tree_view_column.go
func (v *TreeViewColumn) SetExpand(expand bool) {
	C.gtk_tree_view_column_set_expand(v.native(), gbool(expand))
}
func (v *TreeViewColumn) SetExpand(expand bool) {
	C.gtk_tree_view_column_set_expand(v.native(), gbool(expand))
}
// SetExpand() is a wrapper around gtk_tree_view_column_set_expand().