Markers on UIAxes in App Designer

Hello i have issue to put markers on UIAxes in App Designer after i press button, opens new figure and markers puts on blank not the image. Thank you for your time.

imshow(a,'Parent', app.UIAxes);
[y, x] = ind2sub(szref,holeidx(plugismissing0));
plot(x,y,'o','linewidth',3,'markersize',10, 'color', 'B')
[y, x] = ind2sub(szref,holeidx(plugismisplaced0));
plot(x,y,'x','linewidth',3,'markersize',10, 'color', 'R')

Answer 1

[J. Alex Lee]

you probably need to issue plot commands specifying "parent" as the app.UIAxes

Answer 2

[Walter Roberson]

When you do not tell plot() which axes to display into, then it will call gca() to find the current axes. gca() will not look for axes whose handle visibility is turned off, but by default handle visibility is off for all uiaxes in app designer.

You need to either turn on handle visibility for the target axes and make it the current axes (not recommended), or else you have to pass the target axes to plot() (recommended)