Bug 120503 Cascading Parameter can not drop into layout
Details: Cascading Parameter can not drop into layout Step: 1.Open a report design and Create a Sample Data Source and data set by "select * from CLASSICMODELS.CUSTOMERS" 2.New a cascading parameter and create CUSTOMERSNUMBER and CUSTOMERSNAME in parameter named number and name. Press OK 3.Drop parameter name into layout. Actual results: The parameter in Cascading Parameter Group can not drop to layout
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DEUtil.java
{
			SlotHandle slotHandle = parent.getSlot( slotID );
			if ( slotHandle != null )
			{
				return slotHandle.getCount( );
			}
			return -1;
		}
		return DEUtil.findPos( parent, slotID, element );
	}
	/**
	 * Finds the position of the child element in the parent element with the
	 * given slotID
	 * 
	 * @param parent
	 *            the parent element
	 * @param slotID
	 *            the slotID
	 * @param child
	 *            the child element
	 * @return the position of the child element
	 */
	public static int findPos( DesignElementHandle parent, int slotID,
			DesignElementHandle child )
	{
		assert slotID >= 0;
		SlotHandle slotHandle = parent.getSlot( slotID );
		return slotHandle.findPosn( child );
	}
	/**