Revert "Remove some BUI boilerplate" (#30214)

Revert "Remove some BUI boilerplate (#28399)"

This reverts commit cbf329a82d.

Content.Client/Power/APC/ApcBoundUserInterface.cs

@@ -2,7 +2,6 @@
 using Content.Shared.APC;
 using JetBrains.Annotations;
 using Robust.Client.GameObjects;
-using Robust.Client.UserInterface;
 
 namespace Content.Client.Power.APC
 {
@@ -20,8 +19,9 @@ namespace Content.Client.Power.APC
         {
             base.Open();
 
-            _menu = this.CreateWindow<ApcMenu>();
-            _menu.OnBreaker += BreakerPressed;
+            _menu = new ApcMenu(this);
+            _menu.OnClose += Close;
+            _menu.OpenCentered();
         }
 
         protected override void UpdateState(BoundUserInterfaceState state)
@@ -36,5 +36,15 @@ namespace Content.Client.Power.APC
         {
             SendMessage(new ApcToggleMainBreakerMessage());
         }
+
+        protected override void Dispose(bool disposing)
+        {
+            base.Dispose(disposing);
+
+            if (disposing)
+            {
+                _menu?.Dispose();
+            }
+        }
     }
 }