Animation problem Can't find Animate Physics

Hi , I can't find the animate Physics in Inspector window of my player in the animator component. Can anyone help . I am also uploading the screenshot of the same and another from unity 3d website to compare what is missing . Please any reply would be helpful. And i am using Unity 3d version 4.5.0f6 and making 2D game on windows 7 ultimate 64 bit.alt text