After you’ve re-designed a form such as adding or deleting controls and moving controls around, the original tab order often no longer fits. On any form, you can control the order in which a user moves throughout a form when they press the [TAB] key.
Changing the Tab Order
Open a form in Design View
Choose the Tab Order command in the Control Layout group on the Form Design Tools Arrange Contextual tab
Figure 60. Tab Order Dialog Box
3. Click and Drag to move the controls into the appropriate tab order, or click Auto Order
4. Click OK