[Problem with reading TCAS- and AI-Traffic-data with VB]

Hi to everyone.

I have a problem with VB and FSUIPC:

I'm programming an application which should show you important flight data, e.g. altitude, position (in a map), gear status and so on.

In the map, where my position is shown, you should see other aircrafts (AI-Traffic), too.

And now here's my problem:

All AI-Traffic- and TCAS-variables which I want to read, return the value "0". An example: I want to read F084 to F087 (TCAS traffic Latitude of aircraft index 1). Return: "0".

"FS-Interrogate" shows me the correct value. Not the value "0".

Another programm called "TCAS2v7" works very well, too. And TCAS2v7 is programmed in VB!

What's the problem?