Testing Tooltips

Hi I'm having trouble testing tool tip

I can't seem to check that it exists during/after a mouse over. I'v tried 3 different appaoches with no luck

//reference to a datagrid

var grid =Aliases.GUI.HwndSource_ExamFilesView.ExamFilesView.Grid.Viewbox.Grid.Border.Grid.dgPackages;

//reference to specific cell in a grid

var rowcell = grid.WPFObject("DataGridRow", "", 1).WPFObject("DataGridCell", "", 2).

//reference to tooltip prop

var refToToolTip = rowcell.ToolTip;

//reference coords of specific row/cell in grid

var   mousex = rowcell .ScreenLeft;
var   mousey = rowcell .ScreenTop;

LLPlayer.MouseMove(mousex , mousey , 1000);

//The above script DOES display a tool tip programatically

//now I want to test that is it actually present

I tried 3 different appacroaches none work

*****************************************************************

option 1.

   if(refToToolTip.IsVisible == true) { //success};

*****************************************************************

option 2.

var textToFind = "John Doe"; //this exists in grid row 1 cell 2

var objChecksum = rowcell.Find("ToolTip", textToFind, 1000);

  if(objChecksum.WaitProperty("Exists", true, 2500))  //this gives a runtime error??? why??
  {

  //success

}

*****************************************************************

option 3.

  if(refToToolTip.WaitProperty("Exists", true, 2500)) //this gives a runtime error??? why??
  {

//success

  }

*****************************************************************

is there a way to test for tooltip mouseover?

Thanks in advance