Overview
Purpose
Radio buttons are used to choose
exactly one option from a limited number of options.You have to implement
at least two radio buttons for one group.One
button must always be selected.If the user should have the chance to choose
no item from the offered options, you have to create a separate radio button with a "No selection" label or similar text which turns off the other contents-related options.Appearance
The platform-specific appearance is used for radio buttons.
Use/Functionality
Mouse
A mouse-click on a non-selected item (symbol or name) activates it and deactivates the selected alternative of the group. A mouse-click on a selected alternative has no effect.
Keyboard
The active control indicator is positioned on an alternative which is not selected and the alternative is selected by pressing the space bar. The selected alternative of the same group is deactivated.