QTP 10 as of now does not display code hinting for flex operations and this can be a real problems for users that work extensively with decriptive programming.
We are currently working with QTP to get this sorted out but till then here is a workaround which you can use.
1.Copy the TeaFlex.xml from Flex folder present inside the Flex plugin for QTP folder and the TeaFlex_AIR.xml from the AIR foder also present inside the same Plugin folder.
2.Place these xml files under the C:\Program Files\HP\QuickTest Professional\dat\Extensibility\TEA folder within the QTP10 installation.
3.Then type regedit in the command prompt and open the registry.
4.Then you need to add string value “C:\Program Files\HP\QuickTest Professional\dat\Extensibility\TEA” to HKEY_CURRENT_USER\Software\Mercury Interactive\QuickTest Professional\MicTest\StepInformationManager\TypeInfoFiles node in the registry.
5.Once you do this restart QTP and you will notice that the code hinting appears 🙂
Flex Automation 
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Excellent post. Helps a lot .
Thanks
Please refer to this screenshot. http://twitpic.com/1btqdm/full
This is QTP 10 recording a Flex 4 (final) application with all the appropriate automation libraries. I even added the registry correction as shown here.
When I record a test against Flex Store, then it works, but of course Flex Store uses mx (halo) component namespace, not spark.
http://twitpic.com/1btsow/full
Could you please advise? Thank you!
Hi Steven
Running a parallel vmware of win xp from a mac machine is not a supported configuration and i think that is where your problem lies cause i have the win xp sp3 +QTP10+IE8+flex4 Plugin configuration and everythings working fine .The reason flexstore is working is becuase it is precompiled with autoation libraries .I would suggest that you try the same on a winodws machine.
Thanks for the reply. I set up QTP 10 (trial version) again on a new Windows machine. This is with WIndows XP SP3 running as the native OS on hardware, not in a VM. I was able to reproduce the problem where TEAPluginIE.dll loads in MSIE 8 when testing the Flex Store, but does not record any Flex mx or spark components. I will update the bug report.