Alex,

Check Autosize property. It should be .F. for right-aligned checkbox to avoid such movement.

>
>I'm stumped by this really weird control behavior.
>
>This is under MereMortals version 6.12.
>
>I have a form with a pageframe. The pageframe has 4 pages.
>
>Page 1 has a grid with a list of employees.
>Page 2 shows personal information for the employee selected in tab1.
>Page 3 shows employment info.
>Page 4 shows hours worked by the employee.
>
>Everything's working nicely and I hadn't touched this form in a few months.
>
>Today I added a new checkbox to page 3.
>
>I open the form, select an employee in page 1, then click on the tab for Page 3. No problem.
>
>When I click again on the SAME tab, the checkbox jumps about 100 pixels to the right.
>
>In case it helps, the checkbox is set as right-aligned, .left=155.
>
>I suspended the program and using sys(1260) got a reference to the checkbox and regardless of whether it hasn't jumped or jumped already, its .left property stays at 155.
>