The problem is, when
this code is run, the UpdateData(FALSE) commands resets all of
the checkboxes that were at the top of the screen (m_check1 ...
Which is one of the many reasons to not use the function. See here for more.
How can I update just m_check20 and m_check21 without updating
the rest of the check boxes on that page?
CButton member variable for each checkbox. Use the
"One must learn from the bite of the fire to leave it alone." - Native American Proverb