When I change a property name in a custom component, the flash compiler throws a ReferenceError.

Question

I'm building a custom Datagrid component, and I had three parameter properties: _columns [Collection], _headerHeight [Inspectable], and _rowHeight [Inspectable]. This all compiled fine, but I needed to change things about the _columns variable, and it made sense to instead create _columnData to store data from a DataProvider. Now it throws a ReferenceError every time I try to Test Movie, saying that the property columnData can't be created, despite listing it in the parameter list in the Flash Professional IDE.
The only thing I can imagine is that Flash is somehow caching an earlier version of my class, but that the Flash IDE is correctly updating itself according to my metadata when I rebuild the component. I've cleared out all the stuff from ~/Library/Application Support/Adobe/Flash CS5/CodeModel, restarted Flash, even built the component from scratch (using the same class) in a new FLA - nothing has worked.
The code causing errors is copied below:
private var _columnData:Object;
private var _headerHeight:Number = 40;
private var _rowHeight:Number = 40;
[Collection(collectionClass="musicone.components.data.DataCollection", collectionItem="musicone.components.controls.datagrid.DatagridColumn", identifier="item")]
public function get columnData():Object {
     return _columnData;
public function set columnData(value:Object):void {
     _columnData = value;
     var _forceClass:DataCollection = value as DataCollection;
     //updateColumns();
     draw();
[Inspectable(type="Number", defaultValue=40)]
public function get headerHeight():Number {
     return _headerHeight;
public function set headerHeight(value:Number):void {
     _headerHeight = value;
     draw();
[Inspectable(type="Number", defaultValue=40)]
public function get rowHeight():Number {
     return _rowHeight;
public function set rowHeight(value:Number):void {
     _rowHeight = value;
     draw();

Answer 1

I would reccomend that you not use scenes for that purpose, not exactly sure why  but scenes are unreliable. Try putting all of your content in one scene, one timeline and just add a few stop() 's at the end of each "scene", then in your code remove scene2 and scene3 three references, and you'll possibly need to change frame anchors/targets also if you have them.
The error indctates that you have called an object that does not exist at the time the code is run, check where you placed your code, should be frame one, scene1, and also check if you have objects entering the stage down the timeline, that do not enter in frame 1, possibly the movieClip? if so add another keyframe on your actions layer on the same frame as the object and enter the call function for it there.