add: case "cmd_delete": case "cmd_shiftdelete": 
context:     supportsCommand: function(command)    {        switch(command) {        case "button_delete":        case "cmd_open":        case "file_message_button":        case "goto_folder_button":            return true;        default:            return false;        }    },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/9f9fbfa333ce4ce7fa50ed42e5d8fb44ab0e42a1/SearchDialog.js/clean/mailnews/base/search/resources/content/SearchDialog.js