Usercontrol with treeview selected event that refreshed another usercontrol not working

I'm relatively new to WPF programming and can't seem to get this working correctly. This is in my mind something rather simplistic that i would like to get working so I didn't try the MVVM framework and decided to keep it simple.

I have a usercontrol treeview with report paths. I have another usercontrol with a reportviewer. Selecting a report path in the treeview should refresh the reportviewer.

I can "call" the method from the treeview usercontrol for refreshing the reportviewer in the report usercontrol but nothing happens.

I was reading other posts and some seem to suggest a button event to a delegate that will allow the other usercontrol method to be executed. I'm not using a button event so I'm a bit puzzled.

I thought I could do something like this:

 private void treeViewMenu_Selected(object sender, RoutedEventArgs e)
 {
    //Get the selected item
 开发者_如何学Go   ....
    //Call the method of another user control
    ReportUserControl ruc = new ReportUserControl();
    ruc.RefreshReport();
 }

Obviously that didn't work...I know that it shouldn't be too difficult but i am in a brain freeze moment and can't seem to get it working.

Any suggestions would be greatly appreciated. Thanks!