void assignCombobox_ItemSelected(MyCubeGrid grid, MyPlayer.PlayerId playerId)
 {
     ulong steamId = playerId.SteamId;
     var identity = MySession.Static.Players.TryGetPlayerIdentity(playerId);
     if (identity == null)
     {
         Debug.Fail("Transfering grid to nonexistent player.");
         return;
     }
     if (grid.IsTransferBlocksBuiltByIDPossible(MySession.Static.LocalPlayerId, identity.IdentityId))
     {
         var messageBox = MyGuiSandbox.CreateMessageBox(
                 styleEnum: Graphics.GUI.MyMessageBoxStyleEnum.Info,
                 buttonType: MyMessageBoxButtonsType.YES_NO,
                 messageText: new StringBuilder().AppendFormat(MyTexts.GetString(MyCommonTexts.MessageBoxTextConfirmTransferGrid), new object[] { grid.DisplayName, identity.DisplayName }),
                 messageCaption: MyTexts.Get(MyCommonTexts.MessageBoxCaptionPleaseConfirm),
                 canHideOthers: false,
                 callback: (result) =>
                 {
                     if (result == MyGuiScreenMessageBox.ResultEnum.YES)
                     {
                         if (MySession.Static.Players.GetOnlinePlayers().Contains(MySession.Static.Players.GetPlayerById(playerId)))
                         {
                             MyMultiplayer.RaiseEvent(grid, x => x.SendTransferRequestMessage, MySession.Static.LocalPlayerId, identity.IdentityId, steamId);
                         }
                         else
                         {
                             ShowPlayerNotOnlineMessage(identity);
                         }
                     }
                 });
         MyGuiSandbox.AddScreen(messageBox);
     }
     else
     {
         var messageBox = MyGuiSandbox.CreateMessageBox(
             buttonType: MyMessageBoxButtonsType.OK,
                 messageText: new StringBuilder().AppendFormat(MyCommonTexts.MessageBoxTextNotEnoughFreeBlocksForTransfer, identity.DisplayName),
                 messageCaption: MyTexts.Get(MyCommonTexts.MessageBoxCaptionError),
                 canHideOthers: false
             );
         MyGuiSandbox.AddScreen(messageBox);
     }
 }