The feature would not be available until the next version of Pro Maps for Google. For now, you have to manually adjust the zoom level in the code as outlined in the How to Article that is available from the pro maps support page.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.