public override void Init(TagHelperContext context) {
     base.Init(context);
     FormContext = context.GetFormContext();
     FormGroupContext = context.GetFormGroupContext();
     InputGroupContext = context.GetInputGroupContext();
     IsInLabel = context.HasLabelContext();
     Size = Size ?? FormContext?.ControlSize;
     if (FormGroupContext != null)
         FormGroupContext.HasLabel = FormGroupContext.HasLabel || !string.IsNullOrEmpty(Label);
 }