Revert "Remove some BUI boilerplate" (#30214)

Revert "Remove some BUI boilerplate (#28399)"

This reverts commit cbf329a82d.

Content.Client/PDA/Ringer/RingerBoundUserInterface.cs

@@ -1,7 +1,6 @@
 using Content.Shared.PDA;
 using Content.Shared.PDA.Ringer;
 using JetBrains.Annotations;
-using Robust.Client.UserInterface;
 using Robust.Shared.Timing;
 
 namespace Content.Client.PDA.Ringer
@@ -19,8 +18,9 @@ namespace Content.Client.PDA.Ringer
         protected override void Open()
         {
             base.Open();
-            _menu = this.CreateWindow<RingtoneMenu>();
+            _menu = new RingtoneMenu();
             _menu.OpenToLeft();
+            _menu.OnClose += Close;
 
             _menu.TestRingerButton.OnPressed += _ =>
             {