         
         ascent = NaN;
         descent = NaN;
-        hostFormat = null;
+
+        hostFormatChanged = true;
     }
 
     /**

                return false;
                                       
            // No reflow for explicit lineBreak
            if (hostFormat.lineBreak == "explicit")
                return false;

            widthConstraint = width;

    override protected function commitProperties():void
    {
        super.commitProperties();
        
        updateStylesIfChanged();

        // EditingMode needs to be current before attempting to set a
        // selection below.
        if (enabledChanged || selectableChanged || editableChanged)
