Problem drawing a ROI on uiaxes

Hi,

I need to interactively draw a ROI in a uiaxes inside an app. I used the drawpolygon function:

app.polygonal_selection = drawpolygon(app.display_image);

where app.display_image is a uiaxes object. The function works well and returns the ROI, but an error occurs if I right-click while drawing the polygon. This should be allowed - the documentation of the drawpolygon function list this as a possible interaction: "Right-click, which does not add a new vertex but closes the polygon from the previous vertex".

The error I get is the following:

Warning: Error occurred while executing the listener callback for event Hit defined for class matlab.graphics.primitive.world.LineStrip:
Functionality not supported with figures created with the uifigure function. For more information, see Graphics Support in App Designer.

Error in images.roi.internal.AbstractPolygon/showContextMenu

Error in images.roi.internal.ROI/determineSelectionStatus

Error in images.roi.internal.ROI/startROIDrag

Error in images.roi.internal.ROI

Error in uiwait (line 81)
    waitfor (hFigDlg, 'WaitStatus', 'inactive');

Error in images.roi.internal.ROI/draw

Error in drawpolygon (line 173)
    h.draw;

Error in tiler/DrawROIButtonPushed (line 234)
                app.polygonal_selection = drawpolygon(app.display_image);

Error in appdesigner.internal.service.AppManagementService/tryCallback (line 333)
                    callback(app, event);

Error in
matlab.apps.AppBase>@(source,event)tryCallback(appdesigner.internal.service.AppManagementService.instance(),app,callback,requiresEventData,event)
(line 35)
            newCallback = @(source, event)tryCallback(appdesigner.internal.service.AppManagementService.instance(), ... 

How can I fix this?

Thanks,

Stefano