You code example got me started in solving my problem. Below is a code snippet solution to remember the previous Flex session’s HDividedBox location. I believe must users would want the location of the screen splitters remembered.

public var _preferences:SharedObject;
private var _currentSplitterLocation:int;

// Get the location of the splitter when the Flex app first starts.
private function creationHandler(event:Event):void {
    _userPreferences = SharedObject.getLocal(”preferences”);

   // Get the current location of the HDividedBox at startup
    _currentSplitterLocation = myDivider.getDividerAt(0).x;

}

// Called when a divider is moved. Add onRelease event to HDividedBox control
public function dividerDragComplete(event:DividerEvent):void {
   // Update the current location of the splitter.
   _currentSplitterLocation += event.delta;
   // Save it to to the shared object.
   _userPreferences.data.divider = _currentSplitterLocation;
}

// Called to load the last sessions divider location from shared object
public function loadDividers():void {
   if(_userPreferences.data.divider !=null) {
      myDivder.getDividerAt(0).x = _userPreferences.data.divider;
   }
}

horizontalGap=”6″

Take a look at the “dividerAffordance” style of the DividedBox class (http://livedocs.adobe.com/flex/3/langref/mx/containers/DividedBox.html).

Try changing your code to something like this:

private function init():void {
    var newChild:VBox = new VBox();
    newChild.percentHeight = 100;
    newChild.percentWidth = 100;
    newChild.setStyle("backgroundColor", "red");

    var label:Label = new Label();
    label.text = "HELLO";
    newChild.addChild( label );
    hdivbox.addChild( newChild );

    callLater(resizer);
}

private function resizer():void {
    hdivbox.getDividerAt(0).x = 50;
    hdivbox.getDividerAt(1).x = 400;
}

Peter