Custom datatip not updated

I have created an image with a custom datatip update function:

h = image([1 2; 3 4]);
f = get(get(h, 'Parent'), 'Parent');
dcm = datacursormode(f);
set(dcm, 'UpdateFcn', @(~, event) num2str(event.Target.CData(event.Position(2), event.Position(1))));
dTip = createDatatip(dcm, h);
dTip.Position = [1 1];

So far, this works as expected. However, when I change the underlying CData:

set(h, 'CData', [100 2; 3 4]);

then the datatip is not automatically updated (datatip value remains at 1). With the standard update function, the datatip window is automatically updated. E.g.:

set(dcm, 'UpdateFcn', '');
set(h, 'CData', [200 2; 3 4]);

The datatip will automatically change to 200.

How can I implement an automatically updating datatip window with a custom datatip function?

Answer 1

[Frank Herzog]

If anybody else has this problem, this call updates the datatip:

dcm.updateDataCursors;

[Andrea]

Very useful. Thanks

Answer 2

[Frank Herzog]

It seems that this issue is resolved in R2020a. The custom datatip is now automatically updated.