Another Flex 2.0.1 bug

Question

I honestly don't understand what's going on, since i updated
to Flex 2.0.1 i found bug after bug.
This time to my surprise i found that the
errorString property is causing a buggy behavior, if i set
an empty String to this property in order to clean a validation
error for a TextInput control then its layout changes, it gets a
weird black color on its border.
Try this one out
<mx:TextInput id="buggy"/>
<mx:Button click = "buggy.errorString = ''"/>
So tell me, why if this WORKED in FLEX 2.0, why did Adobe had
to change it ? How is it supposed to work now?

Answer 1

The problem is in the UIComponent.as file in mx.core. In Flex
2.01 they factored out the border color for error string logic into
a separate method setBorderColorForErrorString():void. Here is the
method in Flex 2.01
private function setBorderColorForErrorString():void
if (!_errorString || _errorString.length == 0)
setStyle("borderColor", origBorderColor);
saveBorderColor = true;
else
// Remember the original border color
if (saveBorderColor)
saveBorderColor = false;
origBorderColor = getStyle("borderColor");
setStyle("borderColor", getStyle("errorColor"));
styleChanged("themeColor");
var focusManager:IFocusManager = focusManager;
var focusObj:DisplayObject = focusManager ?
DisplayObject(focusManager.getFocus()) :
null;
if (focusManager && focusManager.showFocusIndicator
focusObj == this)
drawFocus(true);
Here is the orignal code from Flex 2.0
public function set errorString(value:String):void
ToolTipManager.registerErrorString(this, value);
_errorString = value;
var p:String;
if (!value || value.length == 0)
saveBorderValues = true;
for (p in origBorderValues)
setStyle(p, origBorderValues[p]);
else
// Remember the original colors, so we can restore them
later.
if (!origBorderValues)
origBorderValues = {};
if (saveBorderValues)
saveBorderValues = false;
for (p in origBorderStyles)
origBorderValues[p] = getStyle(p);
for (p in origBorderStyles)
setStyle(p, origBorderStyles[p]);
styleChanged("themeColor");
var focusManager:IFocusManager = focusManager;
var focusObj:DisplayObject = focusManager ?
DisplayObject(focusManager.getFocus()) :
null;
if (focusManager && focusManager.showFocusIndicator
focusObj == this)
drawFocus(true);
dispatchEvent(new Event("errorStringChanged"));
}