3 combox box on the form with rowsource

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I have 3 comboboxes on the form and all of them have a query for their
row source.

It seems MS Access running teh query in the background to get the list
which is very slow to load the form.


Is it possibe to link row sourrce at run time after form load that
makes it easier for the user?
If yes, can you please give me a link or a sample?

Your information is great appreciated,


.