Sample: dhtmlxToolbar Button Tooltip dhtmlxToolbar main page
X
 
<script>
 
    var webBar = new dhtmlXToolbarObject("toolbarObj");
    ...
    // setting a tooltip for a button
    webBar.setItemToolTip(itemId, tip);
    // getting a tooltip of a button
    var tip = webBar.getItemToolTip(itemId);
</script>