GtkCTreeExpanderStyle is deprecated and should not be used in newly-written code.
The appearance of the expander buttons, i.e. the small buttons which expand or contract parts of the tree when pressed.
Value | Symbolic name | Description |
| 0 | Gtk::CTREE_EXPANDER_NONE | No expanders. |
| 1 | Gtk::CTREE_EXPANDER_SQUARE | Square expanders. |
| 2 | Gtk::CTREE_EXPANDER_TRIANGLE | Triangular expanders. |
| 3 | Gtk::CTREE_EXPANDER_CIRCULAR | Round expanders. |