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Tooltips are added since Telerik Reporting R1 2017. The feature allows you add custom text and title of a box displayed on hover of an element in a Telerik Report. All report viewers provide support for displaying tooltips in a report viewer’s native rendering technology. Tooltips are supported also in PDF files.

Settings in Reports

Each Report section and item has a Tooltip property where you can configure the Text you want to appear on hover. You can also specify a Title for the tooltip's box.

The Series collection of the Graph item also has support for tooltips.

Settings in Viewers

The HTML5 Viewer (JavaScript, MVC and WebForms), WinForms ReportViewer and WPF ReportViewer controls have ToolTipOpening events. In this events you can modify tooltips content:

If you use the HTML5 Viewer, the new Tooltips functionality requires additional Kendo UI dependency. This dependency is included in the Kendo UI subset bundle provided by Telerik Reporting - telerikReportViewer.kendo-2022.3.913.min.js.
If you use a custom set of Kendo UI widgets, you can load kendo.tooltip.min.js of your version (2015.3.1111+) of Kendo UI.

See Also

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