exception when calling SetUIHandler for axWebBrowser

[Clemens Chiba - Greentube I.E.S. AG]

Hi!

I implemented an interface for IDocHostUIHandler to be able to
switch off scroll bar, border, ... by default in my axWebBrowser
control.

I used the code of John posted here nearly 2 years ago:

http://makeashorterlink.com/?X2BA32116

Everything worked fine on my PC but when I tried to run the
application on a TabletPC it seems to crash in the code below:

IHTMLDocument2 hDoc =
(IHTMLDocument2)this.browserVisitingCard.Document;
((ICustomDoc)hDoc).SetUIHandler((IDocHostUIHandler )this);

With these two lines commented out the program works (but
of course with the borders, ... in my browser control).

What can I do to make it working on the TabletPC?
Can it have something to do with the different operating
systems (Win2000 on my PC, of course XP on the TabletPC)?

Thanks for suggestions in advance.

Ciao and bye,
(:Clemens:)