What is the equivalent of Set-RoleInstanceCount (ps1) in Microsoft.WindowsAzure.Management.Compute API?

Hi,

Can I know what is the equivalent of Set-RoleInstanceCount (ps1) in Microsoft.WindowsAzure.Management.Compute API?
I'm trying to use the Microsoft.WindowsAzure.Management.Compute API to increase/decrease the number of instances in cloud services programmatically

Thanks.