Excel VBA - Run macro if cell in range is clicked and selected

I need a routine that can identify if a cell was clicked in a range and then run a macro. I've got this solved partly.

My problem is:
I need to toggle a value whenever the cell is clicked, not whenever the cell is selected, so

Private Sub Worksheet_SelectionChange(ByVal Target As Range)    

If Not Intersect(Target, Range(testRange) Is Nothing Then
   'Cell was Clicked
End If

End Sub

does only work for me as long the cell is not selected.

What can I do? Is there a function to check if a mouse click was performed and the cell selected?