internal override string GetClientConstructor(bool instanceOnly, string body)
{
string field = this.Field.Count == 0 ? "{xtype: \"textfield\"}" : "{}";
string template = (instanceOnly) ? "new {1}({3},{2})" : "new {1}({3},{2});";
return string.Format(template, this.ClientID, this.InstanceOf, body ?? this.InitialConfig, field);
}