A custom drag proxy implementation specific to Ext.panel.Panels. This class -is primarily used internally for the Panel's drag drop implementation, and -should never need to be created directly.
-True to insert a placeholder proxy element -while dragging the panel, false to drag with no proxy (defaults to true). -Most Panels are not absolute positioned and therefore we need to reserve -this space.
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The Ext.panel.Panel to proxy for
-Configuration options
-Gets the proxy element. This is the element that represents where the -Panel was before we started the drag operation.
-Gets the proxy element. This is the element that represents where the -Panel was before we started the drag operation.
-The proxy's element
-Moves the proxy to a different position in the DOM. This is typically -called while dragging the Panel to keep the proxy sync'd to the Panel's -location.
-The proxy's parent DOM node
-(optional) The sibling node before which the -proxy should be inserted (defaults to the parent's last child if not -specified)
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