>When the drop down list is open if you highlight the value in the box and try to overtype it will not accept the value you are trying to enter, is this normal behaviour or is there a setting I have missed. I have tried it with selectonentry both ways but get the same action.
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Ian,

You cannot overrite values in a combo list. You can only type new value in the text portion of the combo. You've to write additional code to add that value to the cobo rowsource.
What're you trying to achieve?