Revert "Remove some BUI boilerplate" (#30214)

Revert "Remove some BUI boilerplate (#28399)"

This reverts commit cbf329a82d.

Content.Client/Arcade/UI/BlockGameBoundUserInterface.cs

@@ -1,6 +1,5 @@
 using Content.Shared.Arcade;
 using Robust.Client.GameObjects;
-using Robust.Client.UserInterface;
 
 namespace Content.Client.Arcade.UI;
 
@@ -16,7 +15,9 @@ public sealed class BlockGameBoundUserInterface : BoundUserInterface
     {
         base.Open();
 
-        _menu = this.CreateWindow<BlockGameMenu>();
+        _menu = new BlockGameMenu(this);
+        _menu.OnClose += Close;
+        _menu.OpenCentered();
     }
 
     protected override void ReceiveMessage(BoundUserInterfaceMessage message)