psc1 file using community extensions

Hi,

if I start Powershell via the short cut in my start menu, I get a nice
looking shell with community extension working. If I execute
"powershell" in the "run" dialog or from command line, I don't get the
extensions. $profile contains the same path in both cases. Could
somebody explain the difference? I'm quite confused.

What I wanted to do is the following:

I wrote some custom Cmdlets, have opened powershell with community
extensions, have added my snapin and have exported my shell via
"export-shell MyShell" into a psc1 file. If I execute that file, I get
an error, because the community snapin is already there, so I removed
all entries from the psc1 file, but let only my snapin there. If I now
start the psc1 file, it works but I don't get the look and feel of the
community extensions.

Any hint how to create a psc1 file using my custom snapin and having
the look and feel of the community extensions?

regards,
Achim