What steps will reproduce the problem?
1. configure CDbConnection::tablePrefix eg: 'yii_'
2. create table in db with prefix, eg: yii_test
3. run protected/yiic shell, try to generate a model 'model Test'

What is the expected output?
Warning: tablename does not exist in database.

The output is as expected but i think there should be a way to generate 
models from prefixed tables without using the prefix in model command for 
shell like 'model yii_test' since i do not want my model to be named 
'yii_test' but instead to be named 'test' or 'Test'. Maybe the shell tool 
could search for yii_test instead of test when CDbConnection::tablePrefix 
is set.

What version of the product are you using? On what operating system?
1.1b, Windows XP (wampserver)