Turn off Tooltip of WPF Toolkit chart control

I am using the WPF ToolKit ChartControl to create a columneries chart. Whenever I move mouse to 开发者_如何转开发my Chart, the ToolTip value will be displayed. I dont need this ToolTip, So how can I turn this off?

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I haven't used this control so I can't say for sure but in general you can disable tooltips by setting the attached property ToolTipService.IsEnabled to false like this:

<TextBlock ToolTip="World" ToolTipService.IsEnabled="False">Hello</TextBlock>