Workflowstage Form Field
The workflowstage form field extends the groupedlist form field type. In this case it shows all workflow stages grouped by workflow. If the field has a saved value this is selected when the page is first loaded. If not, the default value (if any) is selected.
- type (mandatory) must be workflowstage.
 - name (mandatory) is the unique name of the field.
 - label (mandatory) (translatable) is the field html label.
 - description (optional) (translatable) is the field description.
 - default (optional) (not translatable) is the default help site URL (not the visible help site name).
 
Implemented by: libraries/src/Form/Field/WorkflowstageField.php
Example XML parameter definition
<field
        name="stage"
        type="workflowstage"
        label="JOPTION_SELECT_STAGE"
        class="js-select-submit-on-change"
        activeonly="true"
        extension="com_content.article"
        >
        <option value="">JOPTION_SELECT_STAGE</option>
</field>