Model Advisor "Fix" Button Disabled in Toolbar but functional via "Fix this Check"

I have a functional model advisor custom check with a "fix" solution implemented (also functional). However the "fix" button is disabled in the toolbar, but I can right-click the failed check and click "fix this check", and the fix solution works as expected. How do I get the toolbar enabled?

All of the help I see on the topic uses a style type of "DetailStyle" whereas I am using "StyleOne" (this is older code I am using in a newer version of matlab). I would like to avoid changing the style type.

My fix is implented as follows:

if self.HasFix
    myAction = ModelAdvisor.Action;
    myAction.setCallbackFcn(@self.Fix);
    myAction.Name = self.FixName;
    myAction.Description = self.FixDescription;
    rec.setAction(myAction);
end

Everything works, just the toolbar "fix" button is disabled for some reason!