Fixed ViewModelBase issue in PRSDigitalKey

PRS.DigitalKey/PRS.DigitalKey/ViewModelBase.cs

@@ -77,6 +77,7 @@ public abstract partial class ViewModelBase : ObservableObject, IViewModelBase
         await OnDeactivated();
     }
 
+    public bool ProgressVisible { get; set; }
 
 
     protected virtual Task OnDeactivated()