This example mark all records of a form grid record looping throught the data source
public void selectall(boolean _select)
{
CompanyInfo localCompanyInfo;
localCompanyInfo = companyInfo_ds.getFirst();
while(localCompanyInfo)
{
this.findRecord(localCompanyInfo);
this.mark(_select);
localCompanyInfo = companyInfo_ds.getNext();
}
}