Tab order determines the order in which focus moves from one component to another when a user presses the tab
key at runtime. The default tab order is left to right and
top to bottom. You can change the tab order of any component.
To set tab order:
In the Visual Designer or the Outline window, select the component.
In the Properties window under the Accessibility section, type the tab index number.
For example, to set a component to be first in the tab order, type 1.