keyboard don't appear with facebook login

I have a problem with ShareKit.

I'm trying to post image and text to facebook, without using the share actionsheet; I use a bar button item; the associated action is

SHKItem *item = [SHKItem image:reportImageView.image text:reportComment title:reportType];
[self becomeFirstResponder];
[SHKFacebook shareItem:item];

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The facebook login page appears but when I touch the username or password field to insert my credentials, the iphone keyboard don't appear.

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I found it. It really was de UIResponder. I just use [self resignFirstResponder] in the main view and become the first responder when it need it. This only happens in IOS4, in IOS5 this doesnt care.