Need help with awesomium browser

Hello. I am using the vb.net sample of awesomium sdk (awesomium.com). While browsing the webform, it saves cookies and user settings into cache folder.

I have added a form, with a tabcontrol that allows me to dublicate webform into multiple tabs. But then if I close the tabbed form, the user cookies are not saved.

When adding webform.dispose into form_closed event, the application hangs forever, but if I wait some seconds and close the application (with taskmanager or "stop" button) and then check my websites (after restarting the application), it remembers the cookies I have saved.

My question is, how do I need to close my application in a correct way that will allow webform to save settings and would not freeze my application?

Thanks!