Fixes a bunch of funny issues i didn't catch (#5752)

Content.Client/Administration/UI/Tabs/AdminbusTab/AdminbusTab.xaml.cs

@@ -7,6 +7,7 @@ using Robust.Client.ResourceManagement;
 using Robust.Client.UserInterface;
 using Robust.Client.UserInterface.Controls;
 using Robust.Client.UserInterface.CustomControls;
+using Robust.Client.UserInterface.XAML;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
 using Robust.Shared.Map;
@@ -20,8 +21,10 @@ namespace Content.Client.Administration.UI.Tabs.AdminbusTab
         private EntitySpawnWindow? _entitySpawnWindow;
         private TileSpawnWindow? _tileSpawnWindow;
 
-        protected override void EnteredTree()
+        public AdminbusTab()
         {
+            RobustXamlLoader.Load(this);
+            IoCManager.InjectDependencies(this);
             // For the SpawnEntitiesButton and SpawnTilesButton we need to do the press manually
             // TODO: This will probably need some command check at some point
             SpawnEntitiesButton.OnPressed += SpawnEntitiesButtonOnOnPressed;
@@ -47,17 +50,27 @@ namespace Content.Client.Administration.UI.Tabs.AdminbusTab
 
         private void SpawnEntitiesButtonOnOnPressed(BaseButton.ButtonEventArgs obj)
         {
-            _entitySpawnWindow ??= new EntitySpawnWindow(IoCManager.Resolve<IPlacementManager>(),
+            //FIXME: WE SHOULDN'T NEED TO CHECK FOR DISPOSED
+            if (_entitySpawnWindow == null || _entitySpawnWindow.Disposed)
+            {
+                _entitySpawnWindow = new EntitySpawnWindow(IoCManager.Resolve<IPlacementManager>(),
                     IoCManager.Resolve<IPrototypeManager>(),
                     IoCManager.Resolve<IResourceCache>());
+            }
+
             EntitySystem.Get<AdminSystem>().OpenCommand(_entitySpawnWindow);
         }
 
         private void SpawnTilesButtonOnOnPressed(BaseButton.ButtonEventArgs obj)
         {
-            _tileSpawnWindow ??= new TileSpawnWindow(IoCManager.Resolve<ITileDefinitionManager>(),
+            //FIXME: WE SHOULDN'T NEED TO CHECK FOR DISPOSED
+            if (_tileSpawnWindow == null || _tileSpawnWindow.Disposed)
+            {
+                _tileSpawnWindow = new TileSpawnWindow(IoCManager.Resolve<ITileDefinitionManager>(),
                     IoCManager.Resolve<IPlacementManager>(),
                     IoCManager.Resolve<IResourceCache>());
+            }
+
             EntitySystem.Get<AdminSystem>().OpenCommand(_tileSpawnWindow);
         }
     }

Content.Shared/Administration/GamePrototypeLoadMessage.cs

@@ -1,12 +1,8 @@
-using System;
 using Lidgren.Network;
 using Robust.Shared.Network;
-using Robust.Shared.Serialization;
 
 namespace Content.Shared.Administration;
 
-[NetSerializable]
-[Serializable]
 public class GamePrototypeLoadMessage : NetMessage
 {
     public override MsgGroups MsgGroup => MsgGroups.String;