The executed code that highlights the active tab in blue is

if this.PageCount > 0 and this.ActivePage > 0
this.pages[this.ActivePage].ForeColor = rgb(0,0,255)

But If I reorder the pages, it highlights the worng tab.

If it's a bug, is there no way to work around it other than manually moving all fields in all pages to a differnet page?

Perhaps I can hack the .frx file to change all the parent fields to the one to the right?