title: react bootstrap readonly input within formcontrol
body: <p>I am using react bootstrap and this framework provides some nice FormControls.</p>
  
  <p>But I would like to make the Input field that is generated within the FormControls to have a prop of readonly="readonly". This way, this field looks the same as my other FormControls, but does not give a keyboard input on IOS. </p>
  
  <p>In my case, the input will be provided by a calendar picker which will be triggered by an popover.</p>
  
  <p>Does anyone know how to give FormControl the parameter readonly="readonly", so that the generated Input field in the browser will have the prop readonly="readonly"?</p>
  
  <p>Many thnx for the answers!</p>