cocoa touch - iPhone SDK 3.0 in-app email - changing navigation bar tint color -

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My app uses the new in-app email feature of the iPhone SDK 3.0.

I want to blacken the tint color of the email UI and make it transparent.

I tried the following code, 

  / * picker.navigationController.navigationBar.tintColor = [UIColor black color]; Picker.navigationController.navigationBar.translucent = Yes; * /

But the color of the scene is changing, 

  MFMailComposeViewController * picker = [[[MFMailComposeViewController alloc] init];

Instead of the compose window, type the window.

Is this the least possible? Or should we paste it with Apple, is it blue?


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