      */
     public function set errorString(value:String):void
     {
-        var oldValue:String = _errorString;
+        oldErrorString = _errorString;
         _errorString = value;
-
-        var showErrorTip:Boolean = getStyle("showErrorTip");
-        
-        if (showErrorTip)
-            ToolTipManager.registerErrorString(this, oldValue, value);
 
         errorStringChanged = true;
         invalidateProperties();

        if (errorStringChanged)
        {
            errorStringChanged = false;
            setBorderColorForErrorString();
        }
        if (blendModeChanged)
        {
            blendModeChanged = false; 

     *  Storage for errorString property.
     */
    mx_internal var _errorString:String = "";
    
    /**
     *  @private
     *  Storage for previous errorString property.
     */
    private var oldErrorString:String = "";

    /**
     *  @private
