Make it possible to view the model of a Power BI dataset

After publishing a dataset to the Power BI service, and connecting to that dataset from PBI desktop for a new report etc, it is not possible to view the Model of that dataset. The "Data" and "Model" windows (left hand menu) disappear completely. It would be great if users building reports off of a Power BI dataset data source could be able to at least view the model of the dataset, so that they can understand the relationships between the tables in the model etc.