Fixed bug related to CustomiseNewForm handler

inabox.wpf/DynamicGrid/DynamicGridUtils.cs

@@ -832,6 +832,7 @@ public static class DynamicGridUtils
             var window = new ThemableWindow() { Title = $"Manage {typeof(TEntity).Name} Forms" };
 
             var grid = new DynamicEntityFormGrid<TEntityForm, TEntity, TEntityLink>(loadEntity());
+            grid.CustomiseNewForm = customiseNewForm;
 
             grid.Refresh(true, true);
             grid.Margin = new Thickness(5);