diff --git a/Content.Client/Launcher/LauncherConnecting.cs b/Content.Client/Launcher/LauncherConnecting.cs
index f4ed4b46ae..101a63a800 100644
--- a/Content.Client/Launcher/LauncherConnecting.cs
+++ b/Content.Client/Launcher/LauncherConnecting.cs
@@ -49,7 +49,7 @@ namespace Content.Client.Launcher
         public event Action<string?>? ConnectFailReasonChanged;
         public event Action<ClientConnectionState>? ConnectionStateChanged;
 
-        public override void Startup()
+        protected override void Startup()
         {
             _control = new LauncherConnectingGui(this);
 
@@ -61,7 +61,7 @@ namespace Content.Client.Launcher
             CurrentPage = Page.Connecting;
         }
 
-        public override void Shutdown()
+        protected override void Shutdown()
         {
             _control?.Dispose();
 
diff --git a/Content.Client/Lobby/LobbyState.cs b/Content.Client/Lobby/LobbyState.cs
index 77bce6d65c..88f940ff28 100644
--- a/Content.Client/Lobby/LobbyState.cs
+++ b/Content.Client/Lobby/LobbyState.cs
@@ -50,7 +50,7 @@ namespace Content.Client.Lobby
 
         private ClientGameTicker _gameTicker = default!;
 
-        public override void Startup()
+        protected override void Startup()
         {
             _gameTicker = EntitySystem.Get<ClientGameTicker>();
             _characterSetup = new CharacterSetupGui(_entityManager, _resourceCache, _preferencesManager,
@@ -114,7 +114,7 @@ namespace Content.Client.Lobby
             _gameTicker.LobbyLateJoinStatusUpdated += LobbyLateJoinStatusUpdated;
         }
 
-        public override void Shutdown()
+        protected override void Shutdown()
         {
             _gameTicker.InfoBlobUpdated -= UpdateLobbyUi;
             _gameTicker.LobbyStatusUpdated -= LobbyStatusUpdated;
diff --git a/Content.Client/MainMenu/MainMenu.cs b/Content.Client/MainMenu/MainMenu.cs
index 1769511982..0cb2c48791 100644
--- a/Content.Client/MainMenu/MainMenu.cs
+++ b/Content.Client/MainMenu/MainMenu.cs
@@ -35,7 +35,7 @@ namespace Content.Client.MainMenu
         private static readonly Regex IPv6Regex = new(@"\[(.*:.*:.*)](?::(\d+))?");
 
         /// <inheritdoc />
-        public override void Startup()
+        protected override void Startup()
         {
             _mainMenuControl = new MainMenuControl(_resourceCache, _configurationManager);
             _userInterfaceManager.StateRoot.AddChild(_mainMenuControl);
@@ -51,7 +51,7 @@ namespace Content.Client.MainMenu
         }
 
         /// <inheritdoc />
-        public override void Shutdown()
+        protected override void Shutdown()
         {
             _client.RunLevelChanged -= RunLevelChanged;
             _netManager.ConnectFailed -= _onConnectFailed;
diff --git a/Content.Client/Sandbox/SandboxSystem.cs b/Content.Client/Sandbox/SandboxSystem.cs
index fc57fab744..05870e3736 100644
--- a/Content.Client/Sandbox/SandboxSystem.cs
+++ b/Content.Client/Sandbox/SandboxSystem.cs
@@ -14,6 +14,8 @@ using Robust.Client.Input;
 using Robust.Client.Placement;
 using Robust.Client.Placement.Modes;
 using Robust.Client.ResourceManagement;
+using Robust.Client.UserInterface;
+using Robust.Client.UserInterface.Controllers.Implementations;
 using Robust.Client.UserInterface.Controls;
 using Robust.Client.UserInterface.CustomControls;
 using Robust.Shared.Input.Binding;
@@ -47,7 +49,6 @@ namespace Content.Client.Sandbox
         {
             Resizable = false;
             _gameHud = IoCManager.Resolve<IGameHud>();
-
             Title = Loc.GetString("sandbox-window-title");
 
             var vBox = new BoxContainer
@@ -125,6 +126,7 @@ namespace Content.Client.Sandbox
         [Dependency] private readonly ITileDefinitionManager _tileDefinitionManager = default!;
         [Dependency] private readonly IInputManager _inputManager = default!;
         [Dependency] private readonly IClientAdminManager _adminManager = default!;
+        [Dependency] private readonly IUserInterfaceManager _userInterfaceManager = default!;
 
         public bool SandboxAllowed { get; private set; }
 
@@ -394,44 +396,16 @@ namespace Content.Client.Sandbox
         // TODO: These should check for command perms + be reset if the round is over.
         public void ToggleEntitySpawnWindow()
         {
-            if (_spawnWindow == null)
-            {
-                if (!CanSandbox()) return;
-
-                _spawnWindow = new EntitySpawnWindow(_placementManager, PrototypeManager, _resourceCache);
-                _spawnWindow.OpenToLeft();
+            if (!CanSandbox())
                 return;
-            }
-
-            if (_spawnWindow.IsOpen)
-            {
-                _spawnWindow.Close();
-            }
-            else
-            {
-                _spawnWindow.Open();
-            }
+            _userInterfaceManager.GetUIController<EntitySpawningUIController>().ToggleWindow();
         }
 
         public void ToggleTilesWindow()
         {
-            if (_tilesSpawnWindow == null)
-            {
-                if (!CanSandbox()) return;
-
-                _tilesSpawnWindow = new TileSpawnWindow(_tileDefinitionManager, _placementManager, _resourceCache);
-                _tilesSpawnWindow.OpenToLeft();
+            if (!CanSandbox())
                 return;
-            }
-
-            if (_tilesSpawnWindow.IsOpen)
-            {
-                _tilesSpawnWindow.Close();
-            }
-            else
-            {
-                _tilesSpawnWindow.Open();
-            }
+            _userInterfaceManager.GetUIController<TileSpawningUIController>().ToggleWindow();
         }
 
         public void ToggleDecalsWindow()
diff --git a/Content.Client/Viewport/GameScreen.cs b/Content.Client/Viewport/GameScreen.cs
index 44cf9e1b13..a796c788aa 100644
--- a/Content.Client/Viewport/GameScreen.cs
+++ b/Content.Client/Viewport/GameScreen.cs
@@ -44,7 +44,7 @@ namespace Content.Client.Viewport
 
         public MainViewport Viewport { get; private set; } = default!;
 
-        public override void Startup()
+        protected override void Startup()
         {
             base.Startup();
 
@@ -88,7 +88,7 @@ namespace Content.Client.Viewport
             _configurationManager.OnValueChanged(CCVars.HudFpsCounterVisible, (show) => { _fpsCounter.Visible = show; });
         }
 
-        public override void Shutdown()
+        protected override void Shutdown()
         {
             _overlayManager.RemoveOverlay<ShowHandItemOverlay>();
             DisposePresenters();
diff --git a/Content.Client/Viewport/GameScreenBase.cs b/Content.Client/Viewport/GameScreenBase.cs
index 94491a659a..a6a39baafa 100644
--- a/Content.Client/Viewport/GameScreenBase.cs
+++ b/Content.Client/Viewport/GameScreenBase.cs
@@ -34,13 +34,13 @@ namespace Content.Client.Viewport
 
         private ClickableEntityComparer _comparer = default!;
 
-        public override void Startup()
+        protected override void Startup()
         {
             _inputManager.KeyBindStateChanged += OnKeyBindStateChanged;
             _comparer = new ClickableEntityComparer(_entityManager);
         }
 
-        public override void Shutdown()
+        protected override void Shutdown()
         {
             _inputManager.KeyBindStateChanged -= OnKeyBindStateChanged;
         }