Revert "Remove some BUI boilerplate" (#30214)

Revert "Remove some BUI boilerplate (#28399)"

This reverts commit cbf329a82d.

Content.Client/Power/Generator/PortableGeneratorBoundUserInterface.cs

@@ -1,7 +1,6 @@
 using Content.Shared.Power.Generator;
 using JetBrains.Annotations;
 using Robust.Client.GameObjects;
-using Robust.Client.UserInterface;
 
 namespace Content.Client.Power.Generator;
 
@@ -17,25 +16,10 @@ public sealed class PortableGeneratorBoundUserInterface : BoundUserInterface
     protected override void Open()
     {
         base.Open();
-        _window = this.CreateWindow<GeneratorWindow>();
-        _window.SetEntity(Owner);
-        _window.OnState += args =>
-        {
-            if (args)
-            {
-                Start();
-            }
-            else
-            {
-                Stop();
-            }
-        };
-
-        _window.OnPower += SetTargetPower;
-        _window.OnEjectFuel += EjectFuel;
-        _window.OnSwitchOutput += SwitchOutput;
+        _window = new GeneratorWindow(this, Owner);
 
         _window.OpenCenteredLeft();
+        _window.OnClose += Close;
     }
 
     protected override void UpdateState(BoundUserInterfaceState state)
@@ -46,6 +30,11 @@ public sealed class PortableGeneratorBoundUserInterface : BoundUserInterface
         _window?.Update(msg);
     }
 
+    protected override void Dispose(bool disposing)
+    {
+       _window?.Dispose();
+    }
+
     public void SetTargetPower(int target)
     {
         SendMessage(new PortableGeneratorSetTargetPowerMessage(target));