Example: Form

These two trees are embedded in a form, together with some standard elements.

• Use TAB key to move the focus between form elements.
  Note that a tree behaves like a single control (like a radio button group)
• Experimental support for WAI-ARIA
• The submit handler is hooked to generate hidden checkbox elements for selected and active nodes.
  Note that in select mode 3 only the topmost nodes are considered.
• The values are then POSTed to the server (together with the other form elements).