Specify contents of the choice control dynamically.
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In the Screen Design page, select the Choice item from and drag it onto the screen.
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In the General Properties view for the choice control, from the Options section, select Dynamic.
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In Value key, enter the value for the key.
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In Display name key, enter the value that the user will see on the device interface.
Note: The display name key and the value name key can be different or the same. The two keys must be children of a key that is a list type.