sortable post menus

I am writing a plugin that adds a menu to the edit post page of the wordpress GUI. My menu displays under the Post Authors, Excerpt, Custom Fields, and Post Revisions menus. These menus are sortable (drag & drop) but mine is not. is there any way to allow the user to sort my menu? Is there any way to specify, in my plugin, an order for these menus to display? For instance, I would like to have my menu appear, by default, above the Post Revisions and Post Author menus.