Adding a value to the Page.xaml.cs

Hello
I am looking to add a value to the "Page.xaml.cs"

myME.LicenseAcquirer.LicenseServerUriOverride = new Uri("http://server.com/auth.aspx", UriKind.Absolute);

How would I do this?

You can read more about this value on
http://msdn.microsoft.com/en-us/library/system.windows.media.licenseacquirer.setlicenseresponse(VS.95).aspx

Please assist ASAP.