title: Bind a combobox to another dataset than the datacontext in WPF
body: <p>Let me explain my challenge. I have a dataset with a datatable that is assigned to the datacontext. One of the fields is a category. All the category names are in another datatable (one to many relationship). </p>
  
  <p>I want the combobox to display all the names in the categories datatable with the correct selected value from the datacontext datatable. So if I change category, datatable1 will be updated with the selectedValue from the combobox.</p>
  
  <p>I read something about a ObjectDataProvider, but I didnt get it to work. How can I manage to get this to work?</p>