form calling

public client static void taxItemGrouplookup(Object _ctrl, CompanyId _company)
{
    Args args;
    CompanyId company;
    FormRun formRun;
    ;

    company = _company;

    if (company == '')
    {
        company = curExt();
    }

    changecompany(_company)
    {
        args = new Args();
        args.name(formstr(TaxItemGroupLookup));
        args.caller(_ctrl);
        formRun = classfactory.formRunClass(args);
        formRun.init();
        _ctrl.performFormLookup(formRun);
    }
}