Attach nodes in Canvas mode
The Diagramming control allows attaching a node to another node, establishing a subordinate - master relationship between them. This can be done by calling attachTo on the client side in Canvas mode, or AttachTo on the server. When a master node is moved, all of its subordinates follow it, so that the initial distance between them stays constant.

Collapsible tree branches in Canvas mode
If a diagram represents a tree structure, the tree branch starting from a node can be collapsed or expanded again in order to hide or display hierarchy details. To enable this, call the setExpandable method on the client or set the Expandable property on the server.

Touch input in Canvas mode
When running under the iOS Safari web browser, the control handles one-finger touch events to allow drawing and selecting items interactively. In addition, the hit-test area around adjustment handles is larger to make touch modifications easier. Two-finger gestures are delegated to the browser - they either scroll the canvas when dragging in the same direction or zoom the page when dragging in opposite directions.

Loading UI controls in the same applet instance
Recent Java and browser versions do not work very well when more than one applets are loaded on the page. Hence we modified the DiagramApplet, used to host the client-side DiagramView control, to also show the miscellaneous UI controls such as Overview, ShapeListBox and Ruler.

Miscellaneous
- User interaction modes (Behavior property) implemented in Canvas mode.
- Validation events for creating, modifying and deleting items implemented in Canvas mode.