Exit problem webfacing

Hi,

When I open a Webfacing appllication using WFInvocation.do?inv=INV1, I
get the logon window. When I logon and then try to exit the application,
the application tries to close the browser and I get the following
message popup 'the Web page you are viewing is trying to close the
window. Do you want to close the window? YES NO.

When I open the same application without using WFInvocation.do?inv=INV1,
I get the Launch button and then when I exit it returns to the Launch
button.

Is it possible that the application returns to the logonscreen when I
try to exit the application, without returning to the launch button?

Thanks,
Michiel 
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