private static IRenderTheme replaceThemeSymbols(RenderTheme renderTheme, IDictionary <object, TextureRegion> regionMap)
        {
//JAVA TO C# CONVERTER WARNING: Java wildcard generics have no direct equivalent in .NET:
//ORIGINAL LINE: org.oscim.theme.styles.SymbolStyle.SymbolBuilder<?> symbolBuilder = org.oscim.theme.styles.SymbolStyle.builder();
            SymbolStyle.SymbolBuilder <object> symbolBuilder = SymbolStyle.builder();
            foreach (Rule rule in renderTheme.Rules)
            {
                replaceRuleSymbols(rule, regionMap, symbolBuilder);
            }
            return(renderTheme);
        }