Changing Folderbrowser Dialog To Openfiledialog?

I am having a problem trying to change a wpf application's folderbrowserdialog to an openfiledialog. The original application works fine and displays all the mp3 in the selected folder on the listview as intended. The problem occurs when I change the code to use an openfiledialog in order to select specific files, the mp3's do not show up in the listview, nor does the context show up in the status bar as the original program did. I have tried writing a test program which only includes a listview, button, and an openfiledialog and it works fine until I try to insert the test code into the original code.

Here is the original code:

Imports System.Text
Imports System.IO
Imports System.Globalization

[Code]....