| onCollapse | fires when cell collapsed |
| onContentLoaded | fires when content is loaded into cell via attachURL() |
| onDblClick | fires on header double-click |
| onDock | fires when cell docked to layout from window |
| onExpand | fires when cell expanded |
| onPanelResizeFinish | fires when one or several cells were resized |
| onResize | fires when layout resizes |
| onResizeFinish | fires when layout resizes |
| onUndock | fires when cell undocked to window |