Bug 188027 PasteAction is diabled
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DesignElementHandle.java
if ( oldContainer == null )
			throw new ContentException( element, -1,
					ContentException.DESIGN_EXCEPTION_HAS_NO_CONTAINER );
		if ( newContainer == null )
			return;
		ContentCommand cmd = new ContentCommand( getModule( ), element
				.getContainerInfo( ) );
		cmd.move( element, new ContainerContext( newContainer.getElement( ),
				toPropName ), newPos );
	}
	/**
	 * Drops a content element from the container, and clear any reference
	 * property which refers the element to drop.
	 * 
	 * @param propName
	 *            name of the property where the content resides
	 * @param content
	 *            a handle to the content to drop
	 * @throws SemanticException
	 *             if the content is not within the container
	 */
	public void dropAndClear( String propName, DesignElementHandle content )
			throws SemanticException
	{
		if ( content == null )
			return;
		ContentCommand cmd = new ContentCommand( getModule( ),
				new ContainerContext( getElement( ), propName ) );
		cmd.remove( content.getElement( ), false );
	}