Want to DataDrive a check property

I have the following bit of code:

'Main Loop

  While Not Project.Variables.SearchPanelLoop.IsEOF

    '(Pick a Task) Double-clicks the KeywordTests.LoopedNavigation.Variables.SearchPanelLoop("Selection") item. 

    Call Aliases.Samtec_ShopFloorControl_AppHost.TaskManagerForm.WindowDockingArea1.DockableWindow1.TaskSearchPanel.TaskListView.DblClickItem(Project.Variables.SearchPanelLoop.Value("Selection"))

    '(Check the Task) Checks whether the 'Exists' property of the Page called up equals True.

    Call aqObject.CheckProperty(Project.Variables.SearchPanelLoop.Value("Control"), "Exists", cmpEqual, True)

    'Right Click on the Tab

    Call Aliases.Samtec_ShopFloorControl_AppHost.TaskManagerForm.MdiTabGroupControl.ClickR(37, 10)

    'close the tab

    Call Aliases.Samtec_ShopFloorControl_AppHost.TaskManagerForm.MdiTabGroupControl.PopupMenu.Click("[0]")

    Call Project.Variables.SearchPanelLoop.Next

  WEnd

And the following object

I have a set of them all in excel, as here:

The Plan SEEMS straightforward enough, and I was able to set it up in the Keyword Interface (Moved to script so I could paste it here. The error is the same, either way)

Anyway, the plan is:

Click on Selection

Check to see if the correct page now exists & report

Loop

But I get:

 I assumed that I SHOULD be able to data drive this, because, in the Keyword view, I can specify exactly this thing:

So, what am I missing?