ListBox .Selected=False won't work

[Ronald]

Hi.

In Access 2003 I have an unbound listbox with 2 columns. It's all standard,
no multiselect.
In the OnClick event of the listbox I use the 2 values in the columns and
then want to reset the selected row.
To do this I've tried:

Me![lstListbox].Selected(Me![lstListbox].ListIndex) = False

For Each varItem In Me![lstListbox].ItemsSelected
Me![lstListbox].Selected(varItem) = False
Next varItem

For lngRow = 0 To Me![lstListbox].ListCount - 1
Me![lstListbox].Selected(lngRow) = False
Next lngRow

but none of them work.
Why?
Please help.

Ronald.