How to use Progress Bar?

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I have a question for my game. My game have 2scenes: Menu and MainGame. The "MainGame" is where player to play. So, i have a problem: my "MainGame" take a few second to load resources, so that i want to make a "Loading" scene before call "MainGame". I use Progress Bar in 2DTK, but i always wondered: how to already loaded MainGame'Resouces while Progress Bar of "Loading" Scene active? What can i do or just stand in?

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Solution: http://docs.unity3d.com/ScriptReference/Application.LoadLevelAsync.html
Thank you, closed.