You can use a standard navitaion:
this.NavigationService.Navigate(new Uri("PanoramaPage1.xaml?buttonid=button1",UriKind.Relative));
Pass your target in object varible and then handle in panomarama page:
protected override void OnNavigatedTo(NavigationEventArgs e)
{
if ( this.NavigationContext.QueryString.ContainsKey( "buttonid" )
{
string buttonid = this.NavigationContext.QueryString[ "buttonid" ];
}
}