3 Tier Application Architecture possible with Azure?

Question

Hi I have been assigned a task of converting an existing 3 Tier application (Presentation Layer, Business Layer and Data Layer) to an Windows Azure Project.

Basically what I did was create a Web Role and put the presentation layer in it then I created 2 separate class library(respectively being the Business and Data Layer) projects and linked them to the presentation layer using references.

However when I deployed the application in Azure only the Web Role (Presentation Layer) was uploaded :/

Can someone tell me if:

1. It even is possible to use a 3 tier architecture with azure
2. If i made a mistake in referencing the projects
3. If this cannot be achieved is there a similar architecture that is like 3 Tier.

Thanks!