This is probably fairly simple but for some reason it's taking me awhile to figure it out so I'm going to just ask the pros...

I'm looking to fill a listbox after the user selects from another listbox in the PMP (Property Manager Page) for an Addin. 

From what I can tell the 'UserPMPage.vb' handles setting up the PMP and the 'PMPHandler.vb' is where code would go to react to making a selection of the first listbox.

I don't know how to go about refreshing the PMP page after a selection from the listbox is highlighted.