Revert "Remove some BUI boilerplate" (#30214)

Revert "Remove some BUI boilerplate (#28399)"

This reverts commit cbf329a82d.

Content.Client/Power/PowerMonitoringConsoleBoundUserInterface.cs

@@ -1,5 +1,4 @@
 using Content.Shared.Power;
-using Robust.Client.UserInterface;
 
 namespace Content.Client.Power;
 
@@ -12,9 +11,9 @@ public sealed class PowerMonitoringConsoleBoundUserInterface : BoundUserInterfac
 
     protected override void Open()
     {
-        _menu = this.CreateWindow<PowerMonitoringWindow>();
-        _menu.SetEntity(Owner);
-        _menu.SendPowerMonitoringConsoleMessageAction += SendPowerMonitoringConsoleMessage;
+        _menu = new PowerMonitoringWindow(this, Owner);
+        _menu.OpenCentered();
+        _menu.OnClose += Close;
     }
 
     protected override void UpdateState(BoundUserInterfaceState state)
@@ -23,6 +22,9 @@ public sealed class PowerMonitoringConsoleBoundUserInterface : BoundUserInterfac
 
         var castState = (PowerMonitoringConsoleBoundInterfaceState) state;
 
+        if (castState == null)
+            return;
+
         EntMan.TryGetComponent<TransformComponent>(Owner, out var xform);
         _menu?.ShowEntites
             (castState.TotalSources,
@@ -38,4 +40,13 @@ public sealed class PowerMonitoringConsoleBoundUserInterface : BoundUserInterfac
     {
         SendMessage(new PowerMonitoringConsoleMessage(netEntity, group));
     }
+
+    protected override void Dispose(bool disposing)
+    {
+        base.Dispose(disposing);
+        if (!disposing)
+            return;
+
+        _menu?.Dispose();
+    }
 }