Export UI: On the item edit form "Delete" button is not functioning when the form is called with ?destination=<some_redirect>

I have created a ctools export_ui plugin type. When i landed on the edit form of one of the available exportable item, for example the edit link is
'/admin/structure//list//edit?destination=, form has buttons "Save" and "Delete". While clicking on the "Delete" button it has to navigate to the delete confirmation form but it redirects to the destination .
Found that the $form_state['op'] is set to 'edit' on "Delete" operation. and function ctools_export_ui_switcher_page is not geting the op as 'delete'.