I've added basic searching to Ext.data.SimpleStore and extended Ext.form.ComboBox to create Ext.form.SelectBox. Type a letter to jump to and select the first matching result. Press that same key to find the next match. Home/End jump to the top/bottom of the list, PgUp/PgDn move the selection one 'page' at a time. There's only one new config option, searchResetDelay which is the amount of time before a search is reset. With a little extra effort this could be modified to support a deeper search so that typing 'Ver' fast would match Vermont instead of searching for matches to V, E and then R.