APEX

Hi everyone,
when I try to get the data from the selected record in a grid, I don't get the values of the selected record, but those of the last record.

var gridID = "orders";
var ig$ = apex.region(gridID).widget();
var grid = ig$.interactiveGrid("getViews","grid");
var model   = ig$.interactiveGrid("getViews","grid").model;
var selectedRecords = grid.getSelectedRecords();

for (idx = 0; idx < selectedRecords.length; idx++) {
    record = model.getRecord(selectedRecords[idx][0]);
    apex.message.alert(model.getValue(record,"USER_NAME"));
}