LabelStack regionLabels = natTable
.getRegionLabelsByXY(event.x, event.y);
if (regionLabels != null
&& regionLabels.hasLabel(GroupByHeaderLayer.GROUP_BY_REGION)
&& this.selectedColumnIndex != -1) {
natTable.doCommand(new GroupByColumnIndexCommand(
this.selectedColumnIndex));
this.selectedColumnIndex = -1;
}
}