Group Boxes and Radio Groups
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A group box (TGroupBox) arranges related controls on a form. The most commonly grouped controls are radio buttons. After placing a group box on a form, select components from the Tool palette and place them in the group box. The Caption property contains text that labels the group box at run time.
The radio group component (TRadioGroup) simplifies the task of assembling radio buttons and making them work together. To add radio buttons to a radio group, edit the Items property in the Object Inspector; each string in Items makes a radio button appear in the group box with the string as its caption. The value of the ItemIndex property determines which radio button is currently selected. Display the radio buttons in a single column or in multiple columns by setting the value of the Columns property. To respace the buttons, resize the radio group component.