如何使用Entity Framework获取ms sql db中的现有项集合

I've just started to explore Entity Framework, and its realy great! But now I have question. In my db "Products" I have table's Product, Component, Product_Component (it's many-to-many connection). I created an .edmx file in my c# project and choose this 3 tables. Now, i can see in listbox items of tables, for example, i can see all rows of Products table using I've just started to explore Entity Framework,