Remove some BUI boilerplate (#28399)

* Remove some BUI boilerplate

- The disposals overrides got removed due to the helper method handling it.
- Replace window creation with CreateWindow helper.
- Fixed some stinky code which would cause exceptions.

* More

* moar

* weh

* done

* More BUIs

* More updates

* weh

* moar

* look who it is

* weh

* merge

* weh

* fixes

Content.Client/Store/Ui/StoreBoundUserInterface.cs

@@ -2,6 +2,7 @@ using Content.Shared.Store;
 using JetBrains.Annotations;
 using System.Linq;
 using Content.Shared.Store.Components;
+using Robust.Client.UserInterface;
 using Robust.Shared.Prototypes;
 
 namespace Content.Client.Store.Ui;
@@ -26,13 +27,10 @@ public sealed class StoreBoundUserInterface : BoundUserInterface
 
     protected override void Open()
     {
-        _menu = new StoreMenu();
+        _menu = this.CreateWindow<StoreMenu>();
         if (EntMan.TryGetComponent<StoreComponent>(Owner, out var store))
             _menu.Title = Loc.GetString(store.Name);
 
-        _menu.OpenCentered();
-        _menu.OnClose += Close;
-
         _menu.OnListingButtonPressed += (_, listing) =>
         {
             SendMessage(new StoreBuyListingMessage(listing));
@@ -77,15 +75,6 @@ public sealed class StoreBoundUserInterface : BoundUserInterface
         }
     }
 
-    protected override void Dispose(bool disposing)
-    {
-        base.Dispose(disposing);
-        if (!disposing)
-            return;
-        _menu?.Close();
-        _menu?.Dispose();
-    }
-
     private void UpdateListingsWithSearchFilter()
     {
         if (_menu == null)