WPF and Spy

[korsar01]

Hello. I have problems with WPF-applications, Spy cannot recognize it for a long period. For example, when I clicked on the hand of Spy then after 10 seconds Spy can recognize(when I move my mouse) one object, then second, third, forth and then QTP hangs or just appeared blank window instead of my WPF-browser-application. I think it's problem with PresentationHost.exe process, because when I kill it - QTP continues to work normal, or sometimes this process disappears(destroys). I tried on another PC - the same problem. How to solve this issue? (with other applications, for example, SilverLight 3.0, QTP works normal)

QTP 11.0, .NET FW 4.0, WPF-browser-application, Internet Explorer 8.0, Windows XP