creating sub branch

[Kesavan T.S]

Hi ,
I created branch1 from HEAD
cvs -rtag -b version_2 mymodule
then I create
cvs rtag -r version_2  -b version_2-1 mymodule

When I started committing  my changes in version_2 and version_2-1 I see in 
wincvs both these branches show as rooted as head (when I do graph).
But after creating branch version_2 if I commit files and then create 
version_2-1 then the branch version_2-1 shows rooted under version_2. Is it 
a better practice to force commit all files after creating a branch before 
creating another branch.

Related question given a branch is there a command to show the sub branches 
rooted from it.

Thanks and Regards,
kesavan