private static UICheckBox AddCheckbox <T>(this UIHelperBase group, string text, string propertyName, CheckboxAttribute attr)
{
var property = typeof(T).GetProperty(propertyName);
return((UICheckBox)group.AddCheckbox(text, (bool)property.GetValue(OptionsWrapper <T> .Options, null),
b =>
{
property.SetValue(OptionsWrapper <T> .Options, b, null);
OptionsWrapper <T> .SaveOptions();
attr.Action <bool>().Invoke(b);
}));
}