HaloBorder.as does not do appropraite null checks when rendering control bar borders

HaloBorder.as does not check that parent is null before trying to access its parent property. This means if you have a dialog that has been removed using PopupManager but it still has an event listener on a button that is preventing it from being garbage collected then the player will crash with:

TypeError: Error #1009: Cannot access a property or method of a null object reference.

The issue could be resolved by replacing the code:

// cornerRadius is defined on our parent container. Reach up
// and grab it. Yes, this is cheating...
if (parent && parent.parent && parent.parent is IStyleClient)

{ radius = IStyleClient(parent.parent).getStyle("cornerRadius"); borderAlpha = IStyleClient(parent.parent).getStyle("borderAlpha"); }

// If our parent has square bottom corners,
// use square corners.
if (IStyleClient(parent.parent).
getStyle("roundedBottomCorners").toString().toLowerCase() != "true")

{ radius = 0; }

with:

// cornerRadius is defined on our parent container. Reach up
// and grab it. Yes, this is cheating...
if (parent && parent.parent && parent.parent is IStyleClient)
{
radius =
IStyleClient(parent.parent).getStyle("cornerRadius");
borderAlpha =
IStyleClient(parent.parent).getStyle("borderAlpha");

// If our parent has square bottom corners,
// use square corners.
if (IStyleClient(parent.parent).
getStyle("roundedBottomCorners").toString().toLowerCase() != "true")

{ radius = 0; }

}