Revert "Remove some BUI boilerplate" (#30214)

Revert "Remove some BUI boilerplate (#28399)"

This reverts commit cbf329a82d.

Content.Client/Chemistry/UI/TransferAmountBoundUserInterface.cs

@@ -2,7 +2,6 @@ using Content.Shared.Chemistry;
 using Content.Shared.FixedPoint;
 using JetBrains.Annotations;
 using Robust.Client.GameObjects;
-using Robust.Client.UserInterface;
 
 namespace Content.Client.Chemistry.UI
 {
@@ -19,7 +18,7 @@ namespace Content.Client.Chemistry.UI
         protected override void Open()
         {
             base.Open();
-            _window = this.CreateWindow<TransferAmountWindow>();
+            _window = new TransferAmountWindow();
 
             _window.ApplyButton.OnPressed += _ =>
             {
@@ -29,6 +28,15 @@ namespace Content.Client.Chemistry.UI
                     _window.Close();
                 }
             };
+            _window.OnClose += Close;
+            _window.OpenCentered();
+        }
+
+        protected override void Dispose(bool disposing)
+        {
+            base.Dispose(disposing);
+            if (!disposing) return;
+            _window?.Dispose();
         }
     }
 }