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
*/
	public void buildContextMenu( IMenuManager menuManager )
	{
		GEFActionConstants.addStandardActionGroups( menuManager );
		Object firstSelectedElement = getFirstElement( );
		Object selectedElements = getSelectedElement( );
		Object multiSelection = getMultiSelectedElement( );
		
		if ( isMutilSelection( multiSelection ) )
		{
			menuManager.appendToGroup( GEFActionConstants.GROUP_UNDO,
					getAction( ActionFactory.UNDO.getId( ) ) );
			menuManager.appendToGroup( GEFActionConstants.GROUP_UNDO,
					getAction( ActionFactory.REDO.getId( ) ) );
			menuManager.appendToGroup( GEFActionConstants.GROUP_COPY,
					new CutAction( selectedElements ) );
			menuManager.appendToGroup( GEFActionConstants.GROUP_COPY,
					new CopyAction( selectedElements ) );
			menuManager.appendToGroup( GEFActionConstants.GROUP_COPY,
					new PasteAction( selectedElements ) );
			menuManager.appendToGroup( GEFActionConstants.GROUP_COPY,
					new DeleteAction( selectedElements ) );
			if ( isRootElementHandleClass( multiSelection ) )
			{
				createInsertElementMenu( menuManager,
						GEFActionConstants.GROUP_EDIT );
			}
			if ( isListHandleCalss( multiSelection ) )
			{
				IAction action = getAction( CreatePlaceHolderPartAction.ID );