I was working with a PopUp window today in Flex 4.1 and was experiencing some wonkiness when I pressed the ‘tab’ key.  Expecting the focus to move from one textinput field to the next, instead, the focus went back to the containing window.  My pop-up window was modal, so this is not what I expected.

My ninja google skillz returned the following fix I thought I’d share with you.  You can find the fix here at DoubletMedia.

I attempted his fix var fm:FocusManager = new FocusManager(this); fm.activate(); in my popup using Flex 4.1 and got the following compiler error:

Description Resource Path Location Type
1067: Implicit coercion of a value of type com.mgh.app.Prompt to an unrelated type mx.managers:IFocusManagerContainer. Prompt.mxml /app/src/com/mgh/app/view line 43 Flex Problem

The documentation for IFocusManagerContainer states:

“The PopUpManager automatically installs a FocusManager in any IFocusManagerContainer it pops up.”

So rather than manually instantiating a FocusManager, I implemented the IFocusManagerContainer in my popup:

<s:Group ... implements="mx.managers.IFocusManagerContainer" ... >

import mx.core.IFlexDisplayObject;
protected var _defaultButton:IFlexDisplayObject;
public function get defaultButton():IFlexDisplayObject {
return _defaultButton;
public function set defaultButton(value:IFlexDisplayObject):void {
_defaultButton = value;