# ToolTip & ScreenTip

When interacting with a cell in the RadHeatMap control, you have the option to display either a [RadToolTip](https://www.telerik.com/products/winforms/documentation/telerik-presentation-framework/tooltips-and-screentips/radtooltip) or a [ScreenTip](https://www.telerik.com/products/winforms/documentation/telerik-presentation-framework/tooltips-and-screentips/screen-tips) when the mouse is positioned over the cell or a group. This behavior can be configured using the **ToolTipDisplayMode** property. By default, the **ToolTipDisplayMode** is set to **ScreenTip**. This property is enumeration and expose the following values.

* **None**: Does not display tool or screen tips.
* **ScreenTip**: When set to ScreenTip, a screen tip is displayed when the mouse is over a cell. The screen tip typically provides more detailed information about the cell's content or purpose.
* **ToolTip**: When set to ToolTip, a RadToolTip is displayed when the mouse is over a cell or a group.

The choice between using RadToolTip or ScreenTip depends on your specific requirements and the functionality you need to achieve. If you need a simple tooltip with basic text content for a specific control, RadToolTip would be sufficient. On the other hand, if you require a more feature-rich tooltip with additional elements, such as images or complex content, ScreenTip would be a better choice.

![WinForms RadHeatMap ScreenTip](https://www.telerik.com/products/winforms/documentation/assets/a2452f26f4ac5998a60c66b1c3b4b5e4/heatmap-tooltip-screentip01.png)

## Customization

Customization of the ToolTip or ScreenTip is possible through two events:

* **ScreenTipShowing**: Occurs when the screen tip is about to be shown. Cancellable.
* **ToolTipShowing**: Occurs when the tool tip is about to be shown. Cancellable.

In this example, we will customize the ScreenTip visual appereance. For this purpose we will subscribe to the **ScreenTipShowing** event. In the event handler, we have access to the ScreenTip object, its properties and the currently hovered cell index. Using the **Index** property from the event arguments, we can get the data object underneath.

#### **Example 1: ScreenTipShowing Event**

```C#
private void RadHeatMap1_ScreenTipShowing1(object sender, HeatMapScreenTipEventArgs e)
{
    if (e.Index.IsDataCell)
    {
        var heatMap = sender as RadHeatMapElement;
        var heatMapItem = heatMap.Definition.GetDataItem(e.Index);
        var dataBoundObject = heatMapItem.DataBoundItem as TempInfo;
        e.CaptionText = "Cell Value: " + e.CaptionText;
        e.Text = "Row Data: " + dataBoundObject.Year.ToString("yyyy") + " Column Data: " + dataBoundObject.Month;
        e.FooterText = "RowIndex: " + e.Index.RowIndex + " ColumnIndex: " + e.Index.ColumnIndex;
    }
}
```

```VB.NET
Private Sub RadHeatMap1_ScreenTipShowing1(ByVal sender As Object, ByVal e As HeatMapScreenTipEventArgs)
    If e.Index.IsDataCell Then
        Dim heatMap = TryCast(sender, RadHeatMapElement)
        Dim heatMapItem = heatMap.Definition.GetDataItem(e.Index)
        Dim dataBoundObject = TryCast(heatMapItem.DataBoundItem, TempInfo)
        e.CaptionText = "Cell Value: " & e.CaptionText
        e.Text = "Row Data: " & dataBoundObject.Year.ToString("yyyy") & " Column Data: " + dataBoundObject.Month
        e.FooterText = "RowIndex: " & e.Index.RowIndex & " ColumnIndex: " + e.Index.ColumnIndex
    End If
End Sub
```

![WinForms RadHeatMap ScreenTip ScreenTipShowing](https://www.telerik.com/products/winforms/documentation/assets/aaee8f2e8971836e0c0adbf5af42ef6e/heatmap-tooltip-screentip02.png)

## See Also

* [Structure](https://www.telerik.com/products/winforms/documentation/controls/heatmap/structure)