public bool TryGetExtraCastedStyleProperty(string p_name, out T p_styleProperty)
        {
            StyleProperty v_property = null;
            var           v_sucess   = ExtraStylePropertiesMap.TryGetValue(p_name, out v_property);

            p_styleProperty = v_property as T;

            return(v_sucess);
        }
 public bool TryGetExtraStyleProperty(string p_name, out StyleProperty p_styleProperty)
 {
     return(ExtraStylePropertiesMap.TryGetValue(p_name, out p_styleProperty));
 }