Bug 120218 Right click menu option to apply theme.
We should support the following right click menu. -- User right clicks int he report design layout area. -- The following menu items needs to be supported Theme --> Apply Theme -->Theme1 -->Theme2 ( similar to Apply style menu option )
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/schematic/providers/SchematicContextMenuProvider.java
*            the edit part view
	 * @param actionRegistry
	 *            the actions registry
	 */
	public SchematicContextMenuProvider( EditPartViewer viewer,
			ActionRegistry actionRegistry )
	{
		super( viewer );
		this.actionRegistry = actionRegistry;
	}
	/**
	 * Gets the action registry.
	 * 
	 * @return the action registry
	 */
	public ActionRegistry getActionRegistry( )
	{
		return actionRegistry;
	}
	/**
	 * Retrieves action item( value ) from the action registry with the given
	 * action ID( key ).
	 * 
	 * @param actionID
	 *            the given atcion ID.
	 * @return The retrieved action item.
	 */
	protected IAction getAction( String actionID )
	{
		IAction action = getActionRegistry( ).getAction( actionID );