void OnBrowserFocusChanged(object sender, GeckoDomEventArgs e)
{
//prevent recursion
_browser1.WebBrowser.DomFocus -= new EventHandler <GeckoDomEventArgs>(OnBrowserFocusChanged);
_model.BrowserFocusChanged();
_browser1.WebBrowser.DomFocus += new EventHandler <GeckoDomEventArgs>(OnBrowserFocusChanged);
}