#XVAL shows data index (integer) instead of string of an array - vb.net

Question

I want to know why #XVAL shows the index (from 0 to 3 since there is 4 items in there) instead of ex:"< .50%" and so on. This will help me to change the desired output, which is "< .50%".
I've tried #AXISLABEL too and it doesn't work.
Here is a snippet of the code:
Private Sub LoadGraphicChart()
Try
C1Chart2.ChartGroups(0).ChartData.SeriesList.Clear()
' Data
Dim items As String() = New String() {"< 0.50%", "0.50% - 1.00%", "1.00% - 2.00%", "> 2.00%"}
Dim unitHData As Double() = New Double() {7 / 100, 0, 0, 1 / 100}
'first try, populating the series
Dim unitH As C1.Win.C1Chart.ChartDataSeriesCollection = C1Chart2.ChartGroups(0).ChartData.SeriesList
'unitH.Clear()
Dim series As ChartDataSeries = unitH.AddNewSeries
series.Label = "Unit Holder"
series.LineStyle.Color = Color.MediumPurple
series.X.CopyDataIn(items)
series.Y.CopyDataIn(unitHData)
'tooltip
C1Chart2.ToolTip.Enabled = True
For Each ds As ChartDataSeries In unitH
ds.TooltipText = "Series = {#TEXT}" + ControlChars.Cr + ControlChars.Lf + "X = {#XVAL}" + ControlChars.Cr + ControlChars.Lf + "Y = {#YVAL:0.00%}"
Next ds
End Try
End Sub
This is what the tooltip currently looks like:

Answer 1

Changing from using tooltiptext to CoordToDataIndex solved my problems.
Here is how I use it:
Private Sub C1Chart2_MouseClick(sender As Object, e As MouseEventArgs) Handles C1Chart2.MouseClick
Dim SeriesOutput As Integer
Dim PointOutput As Integer
Dim DistanceOutput As Integer
Dim items As String() = New String() {InputLabel10.Text, InputLabel9.Text, InputLabel8.Text, InputLabel7.Text}
Dim unitHData As String() = New String() {FormatPercent((CDbl(lblPersen00.Text) / 100)), FormatPercent((CDbl(lblPersen05.Text) / 100)), FormatPercent((CDbl(lblPersen10.Text) / 100)), FormatPercent((CDbl(lblPersen20.Text) / 100))}
C1Chart2.ChartGroups.Group0.CoordToDataIndex(e.X, e.Y, CoordinateFocusEnum.XandYCoord, SeriesOutput, PointOutput, DistanceOutput)
Debug.WriteLine("Series Index : " & SeriesOutput.ToString())
Debug.WriteLine("Point Index : " & PointOutput.ToString())
Debug.WriteLine("Distance from Point: " & DistanceOutput.ToString())
'MessageBox.Show(PointOutput)
If PointOutput.ToString <> "" Then
MessageBox.Show("X : " & items(PointOutput) & ControlChars.Cr & ControlChars.Lf & "Y : " & unitHData(PointOutput))
End If
End Sub
Result(First Data):
Result(Last Data):