For your first question. Go to Annotation in Toolbox and select Rectangle from it. Click on the diagram and the tool will create a small rectangle. Drag it over the components you want to be in that tier.
Now, right click on the rectangle in the diagram and go to Format--> Alignment -->Send to back.It will put the rectangle in the background and all the components in foreground.
Anurag Narayan<br />SCJP5,SCEA(OCMJEA)
Joined: Jun 11, 2009
Thanks, it is so easy.. But how about a database symbol??