Don't use a checkbox from the Control Toolbox. Instead, use a
checkbox from the Forms toolbar, or see
http://gregmaxey.mvps.org/Add_Toggle_Objects.htm for another
method to create a checkbox.

OD wrote:

I created a document that has check boxes in it. However after I save it and
try to reopen it, it opens in design mode and the check boxes can't be used
until design mode is closed. When I save the document, Design mode is closed
so I'm unsure why it keeps opening each time I access the file.