Bug 122869 Drag a parameter from data explorer view into a table in library, a new parameter is created automatically.
Description:Drag a parameter from data explorer view into a table in library, a new parameter is created automatically. Steps to reproduce: 1. Add a cascading parameter and a table in a library file. 2. Drag a parameter from data explorer view into a table cell in layout editor. 3. Find that a new parameter was added in data explorer view automatically.
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DEUtil.java
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 );
	}
	/**
	 * Gets the element name. The object is a long string that separated with
	 * the separator "."