I have a datagrid with 2 columns. One column contains role information, the other column should have a combo box with a list of available users. The data in the combobox is unre
the columns in the datagrid dont have a datacontext, as they are never added to the visual tree. sound a bit wierd but have a look at vinces blog, its got a good example of the visual layout. once the grid is drawn the cells have a data context and you can set the combo boxes items source in them using normal bindings (not static resources..)
you can access the combo box items source as such
have a look here and also here for some code