Bug 176450 Support link to CSS Feature(Model Part)
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/LibraryHandle.java
Theme theme = libElement.findNativeTheme( themeName );
		if ( theme == null )
		{
			ThemeHandle newTheme = getModuleHandle( ).getElementFactory( )
					.newTheme( themeName );
			try
			{
				getThemes( ).add( newTheme );
			}
			catch ( ContentException e )
			{
				assert false;
			}
			catch ( NameException e )
			{
				assert false;
			}
			theme = (Theme) newTheme.getElement( );
		}
		try
		{
			if ( libElement.getThemeName( ) == null )
				setThemeName( themeName );
		}
		catch ( SemanticException e )
		{
			assert false;
		}
		return (ThemeHandle) theme.getHandle( module );
	}