How to refresh datasource args caller[X++]

To refresh  datasource args caller, you must add override method close on form
like source code below :

public void close()
{
    FormRun         callerForm;
    ;
    callerForm          = element.args().caller();
    callerForm.dataSource().reread();
    // callerForm.dataSource().refresh();
　　 // -1 means refresh all records, the default is -2 which refreshes only certain specific records (eg marked)
　　 callerForm.dataSource().refreshEx();    
　　 super();
}

    common = args.record();
    if (common.isFormDataSource())
    {
        formDataSource = common.dataSource();

        formDataSource.formRun().lock();
        formDataSource.reread();
        formDataSource.refreshEx();
        formDataSource.active();
        formDataSource.formRun().unLock();
    }

AX2012

_dataSource.reread();

trvExpTable_1_ds.research(true);

cancel button

void clicked()
{
    trvExpTable trvExpTable;
    ;
    if( !element.THK_validateCancel(trvExpTable_1_ds, #TrvTableSelected))//1
        return;

    TrvPost::THK_cancelMultiple(trvExpTable_1_ds);

    trvExpTable_1_ds.research(true);

}

process class

// VAR Changed on 10/12/2013 at 15:09:27 by THK7519 WO-PG020
public static void THK_cancelMultiple(FormDataSource _formDataSource,
                                      boolean        _selectedAll = false)
{
    trvExpTable buffer;
    trvExpTable trvExpTable;
;
    if(_formDataSource.table() != tableNum(trvExpTable))
        return;

    ttsBegin;
    if(!_selectedAll)
    {
        for (buffer = _formDataSource.getFirst(true) ? _formDataSource.getFirst(true) : _formDataSource.cursor(); buffer; buffer = _formDataSource.getNext())
        {
            trvExpTable = trvExpTable::find(buffer.ExpNumber, true);
            if(trvExpTable)
            {
                trvExpTable.THK_PostStatus = THK_PostStatus::Cancelled;
                trvExpTable.update();
            }
        }
    }
    else    // Post everything that's visible in the GRID
    {
        buffer = _formDataSource.getFirst();
        while(buffer)
        {
            trvExpTable = trvExpTable::find(buffer.ExpNumber, true);
            if(trvExpTable)
            {
                trvExpTable.THK_PostStatus = THK_PostStatus::Cancelled;
                trvExpTable.update();
            }
            buffer = _formDataSource.getNext();
        }
    }
    ttsCommit;
    _formDataSource.reread();
}