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
Class base = baseHandle.getClass( );
			for ( int i = 1; i < list.size( ); i++ )
			{
				Object obj = list.get( i );
				if ( base.isInstance( obj ) )
				{
					continue;
				}
				
				
				while ( !base.isInstance( obj ) )
				{
					base = base.getSuperclass( );
				}
				continue;
			}
			return base;
		}
		return null;
	}
	/**
	 * Gets the current selected row objects.
	 * 
	 * @return The current selected row objects.
	 */
	public List getRowHandles( )
	{
		List list = getSelectedObjects( );
		if ( list.isEmpty( ) )
			return Collections.EMPTY_LIST;