ContextWindow: Add HasContextLoaded property

Elwig/Windows/AdministrationWindow.cs

@@ -104,6 +104,7 @@ namespace Elwig.Windows {
                 cb.SelectionChanged += ComboBox_SelectionChanged;
             foreach (var lb in ListBoxInputs)
                 lb.SelectionChanged += ComboBox_SelectionChanged;
+            LockInputs();
         }
 
         private void OnClosing(object? sender, CancelEventArgs evt) {