rowPostSelectionProvider.setSelection(new StructuredSelection(object))

NatTable.handleLayerEvent(ILayerEvent event) {
//... some stuff before ...

if (event instanceof ISelectionEvent) {
    if (event instanceof CellSelectionEvent || event instanceof RowSelectionEvent) {
        Event e = new Event();
        e.widget = this;
        try {
            notifyListeners(SWT.Selection, e);
        } catch (RuntimeException re) {
            re.printStackTrace();
        }
    }
// ... the rest of the method
}