How to use custom domain for the site that hosted on windows azure VM?

Hello,

I've a problem using custom domain name for my hosted application on windows azure vm. On VM, i hosted my application on IIS using following binding:

Type: http

IP Address: All Unassigned

Port: 80

Host name: myapp.cloudapp.net

I can see my web apps through myapp.cloudapp.net.

I added CNAME record for "sample.mydomain.com" to redirect to myapp.cloudapp.net. But when I go to sample.mydomain.com, I am seeing default IIS page instead of my website.

What could be the problem? Please advice.

Thanks in advanced!