add: enabled = false; break; case "button_delete":  if (GetNumSelectedMessages() <= 0 || isNewsURI(gSearchView.getURIForViewIndex(0))) 
context:     isCommandEnabled: function(command)    {        var enabled = true;                switch (command) {           case "goto_folder_button":            if (GetNumSelectedMessages() != 1)              enabled = false;            break;          default:            if (GetNumSelectedMessages() <= 0)              enabled = false;            break;        }        return enabled;    },
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/7c4713620c4bc547a50ce0372acdffc92890942f/SearchDialog.js/clean/mailnews/base/search/resources/content/SearchDialog.js