When using DataTemplateSelector in a WPF application, what kind of user action would trigger DataTemplateSelector.SelectTemple? And what is passed into "object item"?When using DataTemplateSelector in a WPF applic
When using DataTemplateSelector in a WPF application, what kind of user action would trigger DataTemplateSelector.SelectTemple? And what is passed into "object item"?When using DataTemplateSelector in a WPF applic