[ansoft]

Не задумывался как то... а контролы ограничены по типам

void performFormLookup()
{
    FormStringControl   callingStringControl;
    FormIntControl      callingIntControl;
    FormInt64Control    callingInt64Control;
    FormDateControl     callingDateControl;
    ;
    if (!callingControl)
        throw(error(Error::wrongUseOfFunction(funcname())));

    switch (callingControl.handle())
    {
        case classnum(FormStringControl):
            callingStringControl = callingControl;
            callingStringControl.performFormLookup(this.formRun());
            break;
        case classnum(FormIntControl):
            callingIntControl = callingControl;
            callingIntControl.performFormLookup(this.formRun());
            break;
        case classnum(FormInt64Control):
            callingInt64Control = callingControl;
            callingInt64Control.performFormLookup(this.formRun());
            break;
        case classnum(FormDateControl):
            callingDateControl = callingControl;
            callingDateControl.performFormLookup(this.formRun());
            break;
    }
}