Why don't the classes in the DBML designer appear in alphabetical order?

I have a DBML file with a very large data model. Whenever I need to add a relationship between to tables I have to select the other table from a combo box whi开发者_如何转开发ch appears to be in in almost random order. Is there a reason these dropdowns aren't in alphabetical order, or is there a way to put them in some kind of order?

Try to edit the .cs code of your dbml file and put the classes in alphabetic order. However it is not safe as the code is autogenerated...