preventing grails-ui tooltip from disappearing

Today I tried to prevent the grails-ui tooltip from disappearing after 5 seconds when the mouse is not moved. From the YUI doc I knew I had to alter a parameter 'autodismissdelay', but I haven't found a way to pass this parameter with the taglib. Unfortunately the only way I succeeded was to alter the ToolTip.js in grails-ui-1.2-SNAPSHOT\web-app\js\grailsui where I changed the value from 5000 to -1.