App Designer - error using the function 'drawpoint' :

Hi all,

I am working on App Designer, and found a issue with the function 'drawpoint'. Initially I was using MATLAB 2019b, in which i got the below error when using 'drawpoint' property 'LabelAlpha'.

Unrecognized property 'LabelAlpha' for class 'images.roi.Point'.

Then I downloaded MATLAB 2020b, thinking it might be MATLAB version issue, but now I get the below error:

Undefined function 'drawpoint' for input arguments of type 'matlab.ui.control.UIAxes'.

This is my code :

roi = drawpoint(app.UIAxes2,'Color','g');
Pon = roi.Position;
roi.Label = num2str(Pon,3);
roi.LabelAlpha = 0;

Not sure of what is the problem. Awaiting your help.

Thank you.