Enums
Value | Symbolic name | Description |
| 0 | GTK_TOOLBAR_CHILD_SPACE | Just a space in the style of the toolbar's GtkToolbarSpaceStyle. |
| 1 | GTK_TOOLBAR_CHILD_BUTTON | A GtkButton. |
| 2 | GTK_TOOLBAR_CHILD_TOGGLEBUTTON | A GtkToggleButton. |
| 3 | GTK_TOOLBAR_CHILD_RADIOBUTTON | A GtkRadioButton, |
| 4 | GTK_TOOLBAR_CHILD_WIDGET | Tells that you want to insert an existing widget. |