Axes themselves do not have tooltips, only series do. Thus, tooltips cannot be added to the y-axis. Add
Closed with the following reason: You can use a similar approach as the one illustrated in this article - http://docs.telerik.com/kendo-ui/controls/charts/how-to/tooltip-for-category-axis-labels For example: <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> <style> .customTooltip { position: absolute; z-index:100; display: none; color: #fff; font-size: 20px Arial, sans-serif; line-height: 20px; text-align: center; vertical-align: middle; background: green; width: 200px; height: 20px; } </style> </head> <body> <form id="form1" runat="server"> <telerik:RadScriptManager ID="RadScriptManager1" runat="server"></telerik:RadScriptManager> <script> function chartLoad(sender) { setTimeout(function () { $ = $telerik.$; var chart = sender.get_kendoWidget(); var tooltip = $(".customTooltip"); chart.surface.bind("mouseenter", function (e) { //debugger if (e.element.tooltipText) { var pos = e.element.bbox().getOrigin(); tooltip.html(e.element.tooltipText) .css({ left: pos.x, top: pos.y + 30 }) .show(); } }); chart.surface.bind("mouseleave", function (e) { if (e.element.tooltipText) { tooltip.hide(); } }); }, 100); } function yLabelsVisual(e) { console.log('v'); // The actual label var labelVisual = e.createVisual(); var bbox = labelVisual.bbox(); // An invisible rectangle to serve as a hot zone var sink = kendo.drawing.Path.fromRect(bbox, { stroke: null, fill: { color: "#fff", opacity: 0 } }); // Maintain reference for event handlers sink.tooltipText = e.text; var visual = new kendo.drawing.Group(); visual.append(labelVisual, sink); return visual; } </script> <div class="customTooltip">CustomTooltip</div> <telerik:RadHtmlChart ID="RadHtmlChart1" runat="server" Width="600" Height="400"> <ClientEvents OnLoad="chartLoad" /> <PlotArea> <Series> <telerik:ColumnSeries Name="Series 1"> <Appearance></Appearance> <SeriesItems> <telerik:CategorySeriesItem Y="30" /> <telerik:CategorySeriesItem Y="10" /> <telerik:CategorySeriesItem Y="20" /> </SeriesItems> </telerik:ColumnSeries> </Series> <YAxis> <LabelsAppearance Visual="yLabelsVisual"></LabelsAppearance> </YAxis> <XAxis> <LabelsAppearance RotationAngle="33"></LabelsAppearance> <Items> <telerik:AxisItem LabelText="Item 1" /> <telerik:AxisItem LabelText="Item 2" /> <telerik:AxisItem LabelText="Item 3" /> </Items> </XAxis> </PlotArea> </telerik:RadHtmlChart> </form> </body> </html>