Postback in Silverlight

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.NET

Silverlight

Hi
I'm developing a silverlight 3 Integrated Website. I have a issue herewith as explained below.

1. In my ASP.net masterpage, I have a header which shows date in a label. The header is formatted in a table.

2. Beneath that a table consists of a table which contains a "Silverlight UserControl" passed as <object> and in another table there is a contentplaceholder1 where all the .aspx pages need to be shown. All these tables are in a UpdatePanel.

And the tables above are in a UpdatePanel themselves.

Now the issue is, the Silverlight control in Table 2 has a hyperlink which hits the code behind to execute its bound click event which navigates a .aspx page in
contentplaceholder1. like

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

When this occurs, the mainpage.xaml's "public MainPage()" is always getting executed.
How to avoid this reloading.

Please help me.