This application connects the bluetooth handsfree and connects the A2dp automaticly. There is an application that connects the a2dp by pressing a button, it's called a2dp. You can find it here: CAB AT THE BOTTOM
A2DPTOGGLE 1.1 this is the app that a2dp auto must work with
http://forum.xda-developers.com/showthread.php?t=437726
This application runs the a2dp toggle command line options to connect the audio to a car radio when the mobile gets connected to the radio for handsfree.
Before you install this application make sure you have installed a2dp toggle. (app shown above) Just install the cab file. After the installation you can start the service with the "Auto A2DP Manager" found in programs, you can also stop the service here. It also starts the service at startup of the device after the installation.
The CPU usage is 0.1% on average and memory usage around 300k.
Let me know if you have some extra idea's.
I like to thank te people that made A2DP Toggle and Pavel Bánský for his windows mobile managed service, his blog can be found
here.
[UPDATE 4/27/2009]
The application has some problems in windows mobile 6.5. It seems that the service runs correctly, but the manager doesn't work.
So in windows mobile 6.5 install the application and soft reset the device. It should then work. Don't use the manager in windows mobile 6.5, it creates new instances of the services and cannot stop them. After a reset they are stopped.
OP
http://forum.xda-developers.com/showthread.php?t=502549