Userform msgbox option to return to parent form

In the following code (button click event) if the user has failed to select any attendees on the form a msgbox pops up giving the user the choose to exit or go back and select attendees on the form. The exit part is easy but I cannot figure out how to stop and leave the form up with the users other selections preserved and allow them to finish the filling out the form. I tied goto to return to the last area in the code before the button click but goto on works in the same procedure
Any help will be appreciated.
Robert

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thanks Leith!
that worked perfect