Bug 183888 BIRT designer - Cube in data explorer
Current behavior - The data explorer view allows uer to change the order of a group level in a hierrachy. Expected behavior - user should not be allowed to change the order of the group level in data explorer view. - Instead user can user cube builder dialog to change the order.
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DNDUtil.java
*            single or multiple transfer data, every data must be an
	 *            instance of <code>DesignElementHandle</code> or
	 *            <code>DesignElement</code>
	 * @param targetObj
	 *            container or sibling. Copy position is after the sibling or
	 *            the last in the container
	 * @return paste result
	 */
	public static boolean copyHandles( Object transferData, Object targetObj )
	{
		targetObj = unwrapToModel( targetObj );
		if ( getColumnHandle( transferData ) != null )
		{
			return copyColumn( getColumnHandle( transferData ),
					targetObj,
					false );
		}
		int canContain = handleValidateTargetCanContain( targetObj,
				transferData,
				true );
		int position = calculateNextPosition( targetObj, canContain );
		if ( position > -1 )
		{
			Object temp = targetObj;
			targetObj = getDesignElementHandle( targetObj ).getContainerSlotHandle( );
			
			if ( targetObj == null )
			{
				targetObj = getDesignElementHandle( temp ).getContainer( );
			}