For a combo box, one way would be to simply include an ALL in your row
source table and then include code to deal with it, eg a select case for
"ALL", etc.
If you can use a list box instead, then you can set the Multi-Select
property to extended, allowing users to use shift and control to select
as many of the values as they want.
Just remove any filtering or Where claues when the box is empty.
Adding an 'All' to a combobox that gets it's values from a table or
query is somewhat complicated.
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