Gmail and number of unread messages near labels

Is there a way to force iPhone's Mail app to get ALL messages by pressing refresh button? By default it shows a number of unread messages only for the main inbox, but I want to know if I have any unread messages in "self-created" labels. I can check it by going to selected label and then pressing "refresh", but it's a nonsense.

For example:



If I had some unread messages in "MyApple", pressing "refresh" wouldn't make the Mail app show a number of them near "MyApple" label - I would need to go into "MyApple" and then press "refresh". It's ridiculous, don't you think? How can I fix it?

Thanks in advance.

It's a normal Gmail setup. Setting it up as an Exchange account makes my inboxes look a bit messy.