If you want show records of a datagrid, you can place a dataview below your datagrid and set the listen to datagrid property of this dataview on your datagrid. See this documentation page.
So it's possible to show all attributes of a single record in your dataview. Of course you place a new datagrid in your dataview to show another objects related to your dataview object.
It's also possible to change your association. If you model a referenceset from project to employee, you can show the complete set in a column of the grid. Names (of what ever attribute you select) will be shown semicolon seperated.
There are multiple ways to achieve this and i believe that you can find all of them in the appstore.
The first would be to use the treeview widget. Allthough it will require 1 click on your project it will retain the info of your other projects allowing you to see multiple projects and their employee's in 1 screen.
The second would be the dataview list that shows a dataview of your project.
A third one would be to use the formloader widget inside a template grid.