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
catch ( SemanticException e )
		{
			stack.rollback( );
			throw e;
		}
		stack.commit( );
	}
	/**
	 * Does some actions when the content is removed from the design tree.
	 * 
	 * @param content
	 *            the content to remove
	 * @param unresolveReference
	 *            status whether to un-resolve the references
	 * @throws SemanticException
	 */
	private void doDelectAction( DesignElement content,
			boolean unresolveReference ) throws SemanticException
	{
		
		removeContents( content );
		
		dropUserProperties( content );
		if ( content.hasReferences( ) )
			adjustReferenceClients( (ReferenceableElement) content,
					unresolveReference );
		adjustReferredClients( content );
		adjustDerived( content );
		
		if ( content.getStyle( module ) != null )