StageWebView does not move when window is moved

Using Flash Builder 4.7, air version 20.0

I moved from HTMLLoader to StageWebView to get better HTML rendering.

webView is created as follows on creationComplete.  The window has no chrome.

webView = new StageWebView(true);

stage.align = StageAlign.TOP_LEFT;

stage.scaleMode = StageScaleMode.NO_SCALE;

webView.stage = this.stage;

webView.viewPort = new Rectangle( nativeWindow.x,nativeWindow.y+25,nativeWindow.width,nativeWindow.height-25 );

webView.loadURL( "http://www.google.com" );

webView.addEventListener(Event.COMPLETE,loadComplete);

webView.addEventListener(Event.LOCATION_CHANGE, locationChange);

webView.addEventListener(ErrorEvent.ERROR,onError);

webView comes up fine and displays, but when I move the window (using nativeWindow.startMove()  because there is no chrome), the StageWebView doesn't move when the window is moved.  I can grab it through the mouse event listeners and manually make it follow, but display is choppy so this isn't a solution.

I have seen the trick to create a bitmap so a menu, for example, can come down over the stagewebview, but I don't want to go down that route until all other avenues are exhausted.  I think it would be very resource intensive to re-render the bitmap every time the mouse moves outside the stageview.

any help would be very much appreciated.

thanks.

fritz