Fired on node drag start Use ui.owner to get a reference to the tree. Use ui.binding to gets a reference to the binding. Use ui.data to get a reference to the data. Use ui.element to get a reference to the element. Use ui.helper to get a reference to the helper. Use ui.offset to get a reference to the offset. Use ui.orginalPosition to get a reference to the original position of the draggable element (the node). Use ui.path to get a reference to the node path. Use ui.position to get a reference to the current position of the draggable element.
Target Platforms: Windows 8.1, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
