Hi Stefen,

Thank you~~~

Hello Charlie,

I have added the functionality you want in the sample. Since the Tooltip that is used for the Series is not the default WPF tooltip, but a custom PopUp, you should set its position and text manually when you want to open it via code behind. I set the needed Properties, so now when the arrow keys are pressed and the point is colored the tooltip also opens. I handled the MouseMove event, so I could be able to set the binding again for the cases when you hover with the mouse.

Hi Stefan,

You really have done me a big favor.  And trouble you again, can I implement below function?

When I clicked one point, I need show the tooltip data, and when I use left arrow or right arrow to move the point,  show the updated tooltip data.   

Thanks really really for your help.  

Hello Charlie,

I have been looking into the sample and I can say that this behavior is expected, because the ToolTip is update when you hove over a Marker. I modified the sample, so now it works as you want. Basically get the current Msrker's Content, which contains the underlying object.

Hi Steven,

I have another question.   Please help. 

I have modified your sample code to implement the "keyboard moving" function, and I have a new requirement: when I click one point, then press the Enter key, show the point's value.  When I use left arrow key or right arrow key to move the point, then press the Enter key, show the current point's value. In my solution, I was trying to use tooltip to show the point's value, and when I press the Enter key, show the tooltip value. But the question is : When I use left arrow key or right arrow key to move the point,  then press the Enter key, the value isn't what the current's point's value.

Do I make myself clearly?  Please see attached. Thanks~~