public static VisualElement MandatoryQ(this VisualElement e, string name = null, string className = null)
 {
     return(UQueryExtensions.MandatoryQ(e, name, className));
 }
 public static T MandatoryQ <T>(this VisualElement e, string name = null, string className = null) where T : VisualElement
 {
     return(UQueryExtensions.MandatoryQ <T>(e, name, className));
 }