Fix EntityButton not inheriting correct type.

Content.Client/GameObjects/Components/Storage/ClientStorageComponent.cs

@@ -225,7 +225,7 @@ namespace Content.Client.GameObjects.Components.Storage
         /// <summary>
         /// Button created for each entity that represents that item in the storage UI, with a texture, and name and size label
         /// </summary>
-        private class EntityButton : Control
+        private class EntityButton : PanelContainer
         {
             public EntityUid EntityuID { get; set; }
             public Button ActualButton { get; private set; }