example code :

public static void main(Args _args)
{
    recID                           recID               = _args.record().RecId;
    tableId                         tableId             = _args.record().TableId;
    HcmEmploymentLeave              HcmEmploymentLeave  = _args.record();
    WorkflowWorkItemTable           workItem            = _args.caller().getActiveWorkflowWorkItem();
    str                             menuItemName        = _args.menuItemName();
    WorkflowWorkItemActionDialog    workflowWorkItemActionDialog;
    WorkflowSubmitDialog            workflowSubmitDialog;
     
    Debug::assert(tableId == tablenum(HcmEmploymentLeave));
    Debug::assert(recId != 0);

    // The method has not been called correctly.
    if (tableId != tablenum(HcmEmploymentLeave) ||
        recId == 0)
    {
        throw error(strfmt("@SYS19306", funcname()));
    }

    // The journal has an active workflow.
    if (workItem.RecId > 0)
    {
        try
        {
            // The journal does support workflow approvals.
            workflowWorkItemActionDialog = WorkflowWorkItemActionDialog::construct( workItem,
                                                                                    WorkflowWorkItemActionType::Resubmit,
                                                                                    new MenuFunction(_args.menuItemName(),_args.menuItemType()));
            workflowWorkItemActionDialog.run();
            if (workflowWorkItemActionDialog.parmIsClosedOK())
            {

                workItem    = _args.caller().getActiveWorkflowWorkItem();
                WorkflowWorkItemActionManager::dispatchWorkItemAction(  workItem,
                                                                    workflowWorkItemActionDialog.parmWorkflowComment(),
                                                                    workflowWorkItemActionDialog.parmTargetUser(),
                                                                    WorkflowWorkItemActionType::Resubmit,
                                                                    _args.menuItemName(),
                                                                    false);
              
            }
        }

        catch(Exception::Error)
        {
            throw error(strfmt("Leave %1 can't be submitted", HcmEmploymentLeave.HRSLeaveReqId));
        }
    }
    // Make the form refresh its common workflow UI controls.
    _args.caller().updateWorkflowControls();
}