How to remove Gmail "sent message" label - OSX Mail

Problem : 

When using Gmail account in  Lion Mail :

While using Lion Mail to send/reply a mail, On Browser, Gmail will show a "sent message" label on Replied or Sent mail.

What should be done to prevent it?

I mean, I don't want to see the "sent message" label on Gmail browser, after I sent a mail using Lion Mail.

1. Open OSX Mail, click on a folder "Sent Mail" under [Gmail] and click on Mailbox menu in the menu bar

Hover over "Use This Mailbox For" and click Sent. This will make Apple Mail use Gmail's Sent Mail folder for sent messages instead of creating its own.

2. A label called "Sent Messages" will show up with your other custom labels.

3. Drag all the messages from the "Sent Messages" label to the "Sent Mail" label, to make sure they're all there

4. You can then delete the "Sent Messages" label.

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