thanks for asking.

I'll need a little more detail from you, though.

How do you launch EyeTV?

And how do you send that command to EyeTV? Using a custom action? If 
so, did you tick the "Activate application" checkbox in the keyboard 
actor?

At any rate, adding an AppleScript actor to your custom action with 
this code

tell application "EyeTV" to activate

should both launch and activate EyeTV.

Best regards, 
Felix