Focus in all cases

Have you also noticed that Flex draws a focus border around its components when you give them focus using the keyboard (by using the tab button)?

Great but why is the focus border not drawn when using the mouse to give a component the focus?

The solution is simple: extend the existing components and force the border drawing yourself:

<mx:CheckBox
      xmlns:mx="http://www.adobe.com/2006/mxml"
      focusIn="onFocusIn()">
<mx:Script>
//
// Support to draw the focus border on focusIn
//
private function onFocusIn(): void
{
      this.drawFocus(true);
}
</mx:Script>
</mx:CheckBox>

Discount code for Adobe Max in Milan

It seems that those who haven't registered yet for Adobe Max can get in for less than those who registered a month ago. Interested in knowing more? Just contact me.

"Classes must not be nested" error

If you ever come across the "classes must not be nested" error (and/or the "internal build" error) then you're in trouble :) There are different possible causes for these errors. In my case it was because I was referring to a none existing component from within an itemRenderer. A good list with a number of potential causes can be found on http://rjowen.wordpress.com/2007/06/21/internal-build-error-or-classes-must-not-be-nested-error/.