update a query count on main form when subform is updated

Hi everyone,

I have a subform in datasheet view that is used to display the
contents of a single table.  I have another subform with a query
feeding it to give a count of how many particular items are in the
table and wanted to ask how I go about updating the count when I
delete a value from the datasheet subform without closing and
reopening the form?

Many thanks for any help you can offer...

Dean...