Predict vending machine UI (#33412)

Content.Client/UserInterface/Controls/ListContainer.cs

@@ -96,9 +96,12 @@ public class ListContainer : Control
         {
             ListContainerButton control = new(data[0], 0);
             GenerateItem?.Invoke(data[0], control);
+            // Yes this AddChild is necessary for reasons (get proper style or whatever?)
+            // without it the DesiredSize may be different to the final DesiredSize.
+            AddChild(control);
             control.Measure(Vector2Helpers.Infinity);
             _itemHeight = control.DesiredSize.Y;
-            control.Dispose();
+            control.Orphan();
         }
 
         // Ensure buttons are re-generated.
@@ -384,6 +387,7 @@ public sealed class ListContainerButton : ContainerButton, IEntityControl
 
     public ListContainerButton(ListData data, int index)
     {
+        AddStyleClass(StyleClassButton);
         Data = data;
         Index = index;
         // AddChild(Background = new PanelContainer