Navigate from the keyboard

To enter data and activate objects without using the mouse, you use the action type InputFocus.
If an object has input focus, key events are sent to that object. For a ValueInput object, this
means that you can enter a value, for a pushbutton it means that you can activate it by
pressing Return.

Focus input is traversed between the objects with the Tab and arrow keys. How the input focus
is traversed, is configured with the attributes NextHorizontal, NextVertical and NextTab.
Here you state the object name of the object that input focus is traversed to by arrow right,
arrow down and Tab keys.

An object that has input focus is usually marked with a relief that surrounds the object.