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
|| multiSelection == DesignElementHandle.class
				
				|| isRootElementHandleClass( multiSelection )
				
				|| multiSelection == ReportItemHandle.class
		
				|| multiSelection == ListHandle.class );
	}
	private boolean isRootElementHandleClass( Object obj )
	{
		return obj == ReportDesignHandle.class || obj == LibraryHandle.class;
	}
	/**
	 * @param menuManager
	 */
	private void createInsertGroupMenu( IMenuManager menuManager,
			String group_name )
	{
		if ( getFirstElement( ) instanceof CellHandle
				|| getFirstElement( ) instanceof RowHandle )
		{
			RowHandle row;
			if ( getFirstElement( ) instanceof CellHandle )
			{
				row = (RowHandle) ( (CellHandle) getFirstElement( ) ).getContainer( );
			}
			else
			{