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A radio button represents an exclusive choice within a set of related options. Within a set of radio buttons, only one button can be ON at any given time. The following figure shows active radio buttons and inactive radio buttons in both ON and OFF states.

Figure 1 Radio Buttons
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When users click a radio button, its setting is always set to ON. An inner filled circle within the round button graphic indicates that the setting is selected. If another button in the set has previously been selected, its state changes to OFF. When a radio button is unavailable, users cannot change its setting.

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Radio Button Menu Items

A radio button menu item is item is a menu item that appears with a radio button next to it to represent an OFF or ON setting. Each radio button menu item offers users a single choice within a set of radio button menu items, as illustrated in the following set of alignment options.

Figure 2 Radio Button Menu Items 
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Note that there is no difference in behavior of radio buttons on Desktop and Embedded, except that there is no mnemonic support on Embedded platforms.

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