combo box question

I have a combobox (cboValue) that has three values, A, B, and C.  A user can ONLY enter one of these 3 values, so I made the type of combobox a dropdown list.  However I have a clear button (btnClear) that clears the combobox.

Private Sub btnClear_Click()
End sub

But when I click on the btnClear I get an error "Text property is read only".  If I turn the combobox to a dropdown combo it will work, but I do not want users to enter in a value that is not on the list.

Is there a work around?

Who is Participating?
Brendt HessConnect With a Mentor Senior DBACommented:
If the selection in the combobox is not mandatory, add a fourth, blank selection to the box.  On the clear button click, select the first item.

Alternately, set the ListIndex to -1 (not selected) on the clear button click.
what you can do is you can comare if the value entered is found in the list. You can quickly loop though the list and see if values match. If not then give a message.
Private Sub btnClear_Click()
End Sub

Private Sub Form_Load()
  cboValue.AddItem "A"
  cboValue.AddItem "B"
  cboValue.AddItem "C"
  cboValue.ListIndex = 0
End Sub

sopheakAuthor Commented:
Thanks bhess1,  setting listIndex to -1 worked
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