Web Forms Combobox default value

Question

Hi

How I can show as selected value in combobox, object that is not on combobox list?
I have object list:

Id
Name 
Active

and combobox should show only active object on list but can also show as selected item with Active:false at first (like default value from another object)

I have something like this:

   <Combobox ItemSource="Binding Source={StaticResource List}}" DisplayMemberPath="Id" SelectedValue="{Binding Id}">