threading fixes

Hyperbar.Windows/Templates/DataTemplateConverter.cs

@@ -0,0 +1,11 @@
+using Microsoft.UI.Xaml.Controls;
+
+namespace Hyperbar.Windows;
+
+public class DataTemplateConverter : ValueConverter<object, DataTemplateSelector> 
+{
+    protected override DataTemplateSelector? ConvertTo(object value, Type? targetType, object? parameter, string? language)
+    {
+        return new TemplateGenerator();
+    }
+}