FlexForm sheet ViewHelper
Groups FlexForm fields into sheets.
Name of the group, used as FlexForm sheet name, must be FlexForm XML-valid tag name string
Label for the field group - used as tab name in FlexForm. Optional - if not specified, Flux tries to detect an LLL label named "flux.fluxFormId.sheets.foobar" based on sheet name, in scope of extension rendering the Flux form.
Freestyle variables which become assigned to the resulting Component - can then be read from that Component outside this Fluid template and in other templates using the Form object from this template