Basic Search Checkbox

[shad]

I’m trying to add a checkbox to Leads basic search that will search for Dead Leads when checked. I added the following code to custom/modules/Leads/metadata/searchdefs.php

'dead_search' =>
          array (
              'name' => 'dead_search',
              'label' => 'LBL_DEAD_SEARCH',
              'type' => 'bool',
              'default' => true,
              'width' => '10%',
          ),

After a repair and rebuild the search field is showing up but as a dropdown with the options Yes/No/Blank.

Not sure what I’m doing wrong.