Bug 154828 Item from library contant user properties can't delete
Details: Item from library contant user properties can't delete Step: 1.New a library. 2.Add a label and add a user properites. 3.Public the library. 4.New a report design and use the library 5.Drop the label from library explorer into layout. 6.Try to delete it. Actual result: The label from library contant user properties can't be delete. Exception reuslt: The label can be delete.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/ContentCommand.java
* are identified by a container ID.
	 * 
	 * @param from
	 *            the old element to replace
	 * @param to
	 *            the new element to replace
	 * @param slotID
	 *            the slot from which to replace the old element
	 * @param unresolveReference
	 *            status whether to un-resolve the references or set the
	 *            reference to null
	 * @throws SemanticException
	 *             if the old element cannot be replaced by the new element into
	 *             this container.
	 */
	public void transformTemplate( DesignElement from, DesignElement to,
			int slotID, boolean unresolveReference ) throws SemanticException
	{
		doReplace( from, to, slotID, unresolveReference );
	}
	/**
	 * @see #transformTemplate(DesignElement, DesignElement, int, boolean)
	 * 
	 * @param oldElement
	 *            the old element to replace
	 * @param newElement
	 *            the new element to replace
	 * @param slotID
	 *            the slot from which to replace the old element
	 * @param unresolveReference