Tooltip on header text

I want to set tooltip property only for column headers and not for the entire columns. I am trying to apply on AfterRender event of the grid. What property needs to be set to make tooltip enabled and where text needs to be specified?

I have tried something like this but it didnt worked

here columns is column list:

 $.each(columns,function(index,column) {
            var eachcolumnheader = column.header[1];
            eachcolumnheader.title= "Tooltip";
            eachcolumnheader.tooltip = true;
            
        });

If you need a tooltip for header only, you can try to use the native HTML tooltips

http://webix.com/snippet/6f7561da