By default, new values added to the Type Attributes list are added to the bottom.  Once you have added a value or values, you can order the list  alphabetically or by moving individual values up and down in the list.  To order  the list alphabetically, right-click on the group name (for example Type) and select Sort and then Ascending or Descending from the popup context menu.  If you want to manually order the list, right-click on a value in the group and select Move Up or Move Down from the popup context menu.