My objective is when I type something in the combobox without pressing the arrow button it will prompt me that my inputs are not in the list???

You need to write some code to check to see if the user typed in something that was not in the combo's internal list and them take specific action to add it - the code depends on the combo's RowSourceType. In version 9, code like this in the combo's Valid() will work for you. It has been so long since I worked with version 3 that I do not remember how you may need to modify this:

IF NOT EMPTY( This.DisplayValue ) AND This.ListIndex = 0
  *** User type in a new value
  *** Display your messagebxo and if the user answers yes,
  *** add the DisplayValue to the underlying RecordSource
  *** and afterward:
  This.Requery()
ENDIF 

Regards,
Marcia G. Akins
Tightline Computers, Inc.