Gtk.ComboBox:active

"active"             Number                : Read / Write

The item which is currently active. If the model is a non-flat treemodel, and the active item is not an immediate child of the root of the tree, this property has the value <literal>gtk_tree_path_get_indices (path)[0]</literal>, where <literal>path</literal> is the Gtk.TreePath of the active item.

Since 2.4