I find the Solution friends,.
In Xaml,.
<treeview height="294" horizontalalignment="Left" margin="48,240,0,0" name="treeView2" verticalalignment="Top" width="198" fontsize="20" fontfamily="Angsana New" selecteditemchanged="treeView2_SelectedItemChanged"> <treeviewitem header="Master" tag="non.xaml"> <treeviewitem header="Event" tag="nok.xaml">
<frame height="449" horizontalalignment="Left" margin="283,173,0,0" name="frame1" verticalalignment="Top" width="675" />
In code
private void treeView2_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
{
TreeViewItem item = (TreeViewItem)treeView2.SelectedItem;
frame1.Source = new Uri(item.Tag.ToString(), UriKind.RelativeOrAbsolute);
}</object>
This is perfictly working,.