Set focus to subform(datasheet) from refresh button

[nathank via AccessMonster.com]

Hello All

I have a refresh button on my main form that will update the current time in
a column(field) on my subform(datasheet). When a user wants to enter a record
into the subform, the user will click the refresh button which will update
the date/time stamp in the last record. When the user clicks the refresh
button, I would like to set the focus to the last record in a particular
column(field) so that the user can begin typing.
So far I cannot figure out how to accomplish this

Thanks in advance for the assistance