in properties set 2 columns, and set widths to eg 0,3
the first column will be width 0, which will be hidden.
the second column will be displayed only. (access actually displays the first non-zero width column)
NOTE that the combobox will still STORE the value of the first column.
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a final note,the combobox wizard suggests this automatically, if you don't use the wizard you have to do it yourslef.