Capabilities used by Manipulators to easily determine valid actions on a GraphElement.
| Selectable | GraphElement is selectable. |
| Collapsible | GraphElement can be collapsed. |
| Resizable | GraphElement is resizable. |
| Movable | GraphElement is movable. |
| Deletable | GraphElement can be deleted. |
| Droppable | GraphElement can be dragged and dropped (using the Drag&Drop events). |
| Ascendable | GraphElement will be brought to the front of its layer when it is selected. |