Vista - Tab completion\expansion in Custom Powershell Provider

Hi,

I have implemented a custom powershell provider. I am getting problems in
implementing tab completion\expansion for it.

If I override the GetChildNames method, I face two issues:

1. Once I write item using WriteItemObject function in the GetChildNames
method, I am not able to rewrite the item programatically.(I can erase the
written word at the command prompt)

2. If user enter some letters and then presses tab, how do I get the letters
that have been entered in the GetChildNames method.

Or is there any other way, than overriding the GetChildNames method, to
implement tab completion\expansion in a provider?

Looking forward for any haelp that I can get.
Thanks in advance!

Regards,