issue with silverlight usercontrol integration into asp web application.

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.NET3.5

C#

.NET

Silverlight

Hi
I'm integrating a silverlight 3 usercontrol to a asp.net application.
I have a masterpage in asp.net application which is built with 2 update panels.

first update panel consists of a table, and its first row contains a logo image, and the second row contains a <object> tag of type silverlight.

second update panel consists of a "div" which contains a ContentPlaceHolder where all the navigational .aspx pages are shown.

Now the issue is when I'm trying to navigate a .aspx page into ContentPlaceHolder,
Application_Exit and Application_Startup are getting fired in silverlight control.

I have a silverlight Button in silverlight usercontrol and whenever user clicks on the button it should navigate to a aspx page "contactus.aspx".

I'm using the below statement to navigate

System.Windows.Browser.HtmlPage.Window.Navigate(new Uri(toNavigate, UriKind.Relative)); 

navigation is getting done correctly, but always the silverlight applications is getting an exit and startup.

Please help me in this regards
Thanks in anticipation.

Sri