Yeah! I found a way...
Based on this source code("Open a Metro Style App from Desktop App"), I realized that I could call the metro apps just as we usually run manually. I mean, if you press Ctrl + Esc and go to metro's screen, you could just type the name of the metro app, such as "store" for example, press Enter and that's it, the metro app is running. Based on this I created a very simple VBScript to do exactly these steps automatically:
Set objShell = WScript.CreateObject("WScript.Shell")
Save this as "metro.vbs" and call it from the command-line with the name of the metro app on first argument:
That is it, very simple and optimized way.
PS: All credits gave to AlKhuzaei, the Codeplex site user who created the related code. Thank you.