Best practice: Implementing dialog boxes
• Be concise and try to avoid making users scroll in a dialog box. Include scroll arrows if your dialog box message or
buttons cannot be displayed fully in the dialog box. If you use standard components, scroll arrows appear automatically
if necessary.
• Always allow users to use the Escape key to close a dialog box.
• If users press the End/Power key when a dialog box appears on an application screen, display the Home screen or
application list. If users return to the application, display the dialog box again.
Guidelines for layout
• Use standard BlackBerry dialog boxes where possible so that you do not have to adjust the layout of each dialog box for
each supported screen size.
• Create dialog boxes that are up to, but not greater than, 90% of the width and height of the screen. If you use standard
BlackBerry dialog boxes, the BlackBerry device automatically calculates the appropriate size for dialog boxes.
• Center the dialog box on the screen. Make sure that the width of the dialog box is at least half the width of the screen. If
you use standard BlackBerry dialog boxes, the BlackBerry device centers the dialog box and adjusts the width of the
dialog box automatically.
• Center the dialog box indicator vertically with the dialog box message.
• Use a standard indicator that is appropriate for the type of dialog box (for example, use an exclamation point (!)
indicator in an alert dialog box). Avoid using multiple indicators in a dialog box.
• Display messages to the right of the indicator and above any buttons. In right-to-left languages, display messages to the
left of the indicator.
• If you give users the option to not show a dialog box again, include a check box in the dialog box and match the
alignment of the check box with the alignment of the dialog box message. Use the label "Don't show again". Place the
check box above the buttons. The check box should be checked by default, unless the dialog box displays a message
with critical information for users.
UI Guidelines Containers and components
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