title: How to disable Multiselect in a Radio group extjs
body: <p>I have a  radiogroup component in a panel in extjs with 3 radiobuttons. But I can select multiple rediobuttons at once, whereas radiogroups should allow to select only one.
  It should be the default behaviuor.</p>
  
  <p>I couldn't find any configuration attribute in radiogroup component to disallow multiselect.</p>
  
  <p>Is there any way to disable multiselect in a radio group in extJs.</p>