FormComponent. Supports RadioGroup, CheckGroup, and AbstractChoice family currently. The behavior is similar to interacting on the browser: For a single choice, such as Radio or DropDownList, the selection will toggle each other. For multiple choice, such as Checkbox or ListMultipleChoice, the selection will accumulate.
@param formComponentId relative path (from Form) to the selectable FormComponent
@param index index of the selectable option, starting from 0
@return This
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