In your web screens you can use radio buttons to retrieve end-user input. Radio buttons are useful when you want to display a group of possible options that are mutually exclusive. This behavior is implemented by the Radio Button widget.
To define a radio button group, each Radio Button widget must be bound to the same variable, i.e. the Variable property must be the same. How?
Besides this, each Radio Button widget should assign a different value to the variable, through the Value property. How?
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Layout of Widgets | Radio Button Widget Properties | Apply Web Styles