CHAPTER 3
Controls
Radio Buttons 3-17
There are two types of radio buttons. One is a small oval that is empty if it is
not selected, or is filled with solid black if it is selected. The oval radio button
is labeled to the right with a word or phrase.
The second type of radio button is a small picture with a border (unless the
picture itself has a continuous edge). Typically, several of these picture radio
buttons are placed next to each other, and the one that is selected is indicated
by a thick border. Figure 3-17 shows some regular radio buttons and some
picture radio buttons.
Figure 3-17 Only one radio button in a cluster can be selected
An application can use radio buttons to control options, such as the order in
which to sort information. An application can also use radio buttons to change
the attributes of a selected object, such as the style of a view. In contrast, an
application should use a text button or a picture button—never use a radio
button—to bring up a slip; to confirm, authorize, cancel, or stop an action; or
to initiate a process.
S
elected
Selected
Not selected
Regular radio
b
uttons
N
ot selected
Picture radio
buttons