How to trigger 'IsRequired' on configurator via button

@danbedwards

A follow up, I am also trying to get the read only status of the control I have this:

((InputControlValueBound<Ice.Lib.Framework.EpiTextBox,String>)Inputs[ctrl.Name.ToString()].Value).ReadlOnly

But the system does not like it. It says there is no such property. Any ideas how I reference if a control is in a read only state?