DataGrid Sorting Issue with Hotfix2

Question

I already opened a ticket with Adobe on this, but since this
is a critical issue for us I wanted to post a message to see if
anyone has any idea where the issue in flex sdk lies.
Check tab 2 of the sample app, Sorting a datagrid who's
column only has partial data causes an error, works fine on Hotfix
1 (same test)
Sample App:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="absolute" creationComplete="creationComplete()">
<mx:Script>
<![CDATA[
import mx.collections.ArrayCollection;
import mx.utils.ObjectProxy;
[Bindable]
public var dgData:ArrayCollection = new ArrayCollection();
public function creationComplete():void
var object:ObjectProxy;
object = new ObjectProxy();
object["filled"] = "Filled A";
object["partial"] = "Partial A";
dgData.addItem(object);
object = new ObjectProxy();
object["filled"] = "Filled B";
object["partial"] = "Partial B";
dgData.addItem(object);
object = new ObjectProxy();
object["filled"] = "Filled C";
dgData.addItem(object);
object = new ObjectProxy();
object["filled"] = "Filled D";
dgData.addItem(object);
]]>
</mx:Script>
<mx:XMLList id="treeData">
<node label="Mail Box">
<node label="Inbox">
<node label="Marketing"/>
<node label="Product Management">
<node label="Large node Large Node Large Node Large
Node"/>
</node>
<node label="Personal"/>
</node>
<node label="Outbox">
<node label="Professional"/>
<node label="Personal"/>
</node>
<node label="Spam"/>
<node label="Sent"/>
<node label="Spam2"/>
<node label="Sent2"/>
<node label="Spam3"/>
<node label="Sent3"/>
<node label="Spam4"/>
<node label="Sent4"/>
<node label="Spam5"/>
<node label="Sent5"/>
<node label="Spam6"/>
<node label="Sent6"/>
</node>
</mx:XMLList>
<mx:TabNavigator height="100%" width="1005">
<mx:Canvas label="Tree Issue">
<mx:Text x="284" y="51" fontSize="16" fontWeight="bold"
text="Issue: Expand the tree node to open up Product Management
node, no Horizontal Scroll bar appears." width="390"/>
<mx:Canvas verticalScrollPolicy="auto"
horizontalScrollPolicy="auto">
<mx:Tree x="50" y="50" width="226" height="303"
dataProvider="{treeData}" labelField="@label"
verticalScrollPolicy="auto" horizontalScrollPolicy="auto"/>
</mx:Canvas>
</mx:Canvas>
<mx:Canvas label="DataGrid Issue">
<mx:DataGrid id="dgTest" dataProvider="{dgData}"
width="500" height="300" x="10" y="10">
<mx:columns>
<mx:DataGridColumn headerText="Filled Row"
dataField="filled"/>
<mx:DataGridColumn headerText="Partially Filled Row"
dataField="partial"/>
</mx:columns>
</mx:DataGrid>
<mx:Text x="10" y="318" fontSize="16" fontWeight="bold"
text="Issue: Toggle the sort in the column that has only partial
data. You will get a find criteria error. This worked in Hotfix 2
and was broke in Hotfix 2." width="390"/>
</mx:Canvas>
</mx:TabNavigator>
</mx:Application>

Answer 1

Hi,
With new hotfixes some bugs ( most of bugs) in Flex SDK are
get fixed, but rarely new (sometimes critical) bugs can appear.
Before Flex 3 release which will allow on IDE level to switch
between different versions of Flex SDK on the fly, I would advice
you to store locallly copy of all versions of Flex 2 SDK released
to the public. Then, in case if you will encounter a serious bug in
the most recent release of Flex 2 SDK, you can fix it by yourlself
by reusing the old code from former release of Flex 2 SDK.
See what I did with found bug in Flex 2.0.1 release, which is
what not present in Flex 2.0 SDK release:
jabbypanda.com/blog/?p=25