title: ExtJS FormPanel Change labelWidth after adding fields dynamically
body: <p>I have a dynamic FormPanel where I need to set the label width after I have loaded in all the fields. I have tried using this.labelWidth = 200 before calling this.doLayout but it's ignoring the new value. </p>
  
  <p>Can someone tell me where I can set this and redraw the form, thanks.</p>