| add_is_collapsed_listener | Add a listener function or method, which will be called as soon as the
property "is_collapsed" has changed. |
| add_selected_device_listener | Add a listener function or method, which will be called as soon as the
property "selected_device" has changed. |
| is_collapsed_has_listener | Returns true, if the given listener function or method is connected
to the property "is_collapsed". |
| remove_is_collapsed_listener | Remove a previously set listener function or method from
property "is_collapsed". |
| remove_selected_device_listener | Remove a previously set listener function or method from
property "selected_device". |
| select_instrument | Selects the track's instrument if it has one. |
| selected_device_has_listener | Returns true, if the given listener function or method is connected
to the property "selected_device". |