Specifies the default TaskDoubleClick action.
Options:
- "Enabled" - event clicking will be enabled, events will be fired, no default action
 - "Disabled" - event clicking will be disabled, no events will be fired
 - "PostBack" (ASP.NET WebForms)
 - "CallBack" (ASP.NET WebForms, ASP.NET MVC)
 - "Bubble" - opens a task bubble
 - "ContextMenu" - opens a task context menu
 
Example
<div id="dp"></div>
<script>
  var gantt = new DayPilot.Gantt("dp");
  gantt.taskDoubleClickHandling = "ContextMenu";
  // ...
  gantt.init();
</script>