Event which is raised on drag.
Function takes arguments evt and ui.
Use ui.metadata to get a reference to the data.
Use ui.helper to get a reference to the helper.
Use ui.offset to get a reference to the offset.
Use ui.originalPosition to get a reference to the original position of the draggable element.
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
