Hi Mr Santos!
I tried to run sample app in VS2008 with IE8, FF3.5 and Chrome on v.6.4 Beta1b and Beta1c - the problem is not reproduced.
If you define what VWG version you use I will try to reproduce this problem on that VWG version. Or if you can only reproduce this on a specific applicaton, please send us your application to Support [at] VisualWebGui [dot] com with a link to this forum thread. We will processed it as soon as possible.
Regards,
Lyudmila Kislitsa
QA Team Manager, the Visual WebGui team