You can customize the tooltip content of ChartNavigator. By default, it displays the value of X-axis when you hover on it. You can also add your customized text that you want to display.

For example, the following steps sets the value of tooltip to Stock Index (Dec'14-Jan'15) using the sample created in the Quick Start section:

In the Designer

1. Right click the ChartNavigator control and select Properties to open the Properties Window.
2. Set the text that you want to display when you hover the mouse over the navigator, in the Tooltip property.
3. Press F5 to run the project.

In Source View

Set the Tooltip text inside the <cC1:C1ChartNavigator> tag to display tooltip.

<cC1:C1ChartNavigator ID="C1ChartNavigator1" runat="server" ToolTip="Stock Index (Dec'14-Jan'15)">

In Code

Add the following code to the Page_Load event to customize tooltip of the ChartNavigator.

C1ChartNavigator1.ToolTip = "Stock Index (Dec'14-Jan'15)";

C1ChartNavigator1.ToolTip = "Stock Index (Dec'14-Jan'15)"

When you run your application, the ChartNavigator appears as shown in the image below: