Hi. I have a big problem that my properties dial box is lost and I already tried so many ways to appear but at last nothing happened.So, anybody who are very expert in autocad can help my problems.

If Ctrl+1 does not help, try:
http://www.cadforum.cz/cadforum_en/qaID.asp?tip=5749
or
http://www.cadforum.cz/cadforum_en/qaID.asp?tip=3703

Thanks you very much for your reply. I got back my properties box but another problem comes again that it doesn't work.For example, I cannot change line weight,colour and line type. If so, can you advice that is what kind of problem? Thanks a lot for your reply but