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Why can't I use app.UIAxes.CurrentPoint in MATLAB R2018b AppDesigner?

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I am currently working with MATLAB R2018b and R2020a AppDesigner.
I need to use the property CurrentPoint of the UIAxes, not the UIFigure, to read the current mouse position when the mouse is on a Axes. Then I use the current mouse X position to read the corresponding Y value of a plotted line in the Axes. I use this command app.UIAxes.CurrentPoint.
It works perfectly in r2020a, but there is no property CurrentPoint of Axes in r2018b, although this website UIAxes Properties -> Interactivity -> CurrentPoint is introduced in R2016a.
Is there anyway to work around this problem?
Thank you very much!

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