Prepares the required information for starting the search pane drag and drop operation.

The unit classifier.The board classifier.The element classifier. This is the element class represented by the dragged search pane item.The drag and drop object.The dragged palette item.Returns the rule's success/failure status.<h2>Dependencies</h2><div class="INSET">None</div> <h2>Behavior</h2> The rule should update the given <code>dnd</code> object with the relevant drag and drop information. See <q ref="core.dev:Controller!DND_OBJECT">DND_OBJECT</q> for details.(c) SAP AG 2003-2006. All rights reserved.