QTP cannot detect the Flex objects

[Sissy]

When I used the QTP to do the automation testing with the project which built by Flash Builder 4, before I perform the QTP testing, I installed the Flex 4 plug-in with QTP, most of the objects can be detected by QTP, but some of the Flex objects cannot be detected, such as <S:RECT></S:RECT>,tooltips in the bulletcontainer...., could you pls help to check the reason, if the Flex 4 plug-in still cannot support it or anything else? Thanks very much!

My testing environment details as below:
The project built by Flash Builder 4.0.1;
QTP 10.00.0;
Flex 4 Plug-in for QTP;
Flash player 10.0;
IE 6.0;
And I built the project with additional compiler argument as below:
-locale en_US -include-libraries "C:\Program Files\Adobe\Adobe Flash Builder 4\sdks\4.1.0\frameworks\libs\automation\automation.swc" "C:\Program
Files\Adobe\Adobe Flash Builder 4\sdks\4.1.0\frameworks\libs\automation\automation_agent.swc" "c:\Program Files\Adobe\Adobe Flash Builder 4\sdks\4.1.0
\frameworks\libs\automation\qtp.swc" "C:\Program Files\Adobe\Adobe Flash Builder 4\sdks\4.1.0\frameworks\libs\automation\automation_dmv.swc" "C:\Program
Files\Adobe\Adobe Flash Builder 4\sdks\4.1.0\frameworks\libs\automation\automation_spark.swc" "C:\Program Files\Adobe\Adobe Flash Builder 4\sdks\4.1.0
\frameworks\libs\automation\automation_charts.swc"

[hoamoclan1604]

I have a same problem. Please help us. Do I need License of QTP to solve this broblem ?