ActiveElementsOverlay ZOrder - How to render overlay behind Digital Zoom control?

MIP
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1

I’m using ActiveElementsOverlayAdd to display polygon shapes on video. The overlay is rendering in front of the Digital Zoom control (+/- zoom buttons and directional arrows), hiding these controls visually.

With IsHitTestVisible = false, clicks pass through to the controls, but the overlay shapes visually cover the Digital Zoom UI, making it hard for users to see the buttons.

I want the overlay to render behind (under) the Digital Zoom control so the controls remain fully visible.

ImageViewerAddOn addOn = // ...
List<FrameworkElement> elements = new List<FrameworkElement>();

// Add polygon with click-through enabled
Polygon polygon = new Polygon();
polygon.Points.Add(new Point(100, 100));
polygon.Points.Add(new Point(200, 100));
polygon.Points.Add(new Point(200, 200));
polygon.Stroke = Brushes.Blue;
polygon.StrokeThickness = 2;
polygon.IsHitTestVisible = false;  // Allows clicks to pass through
elements.Add(polygon);

// Register overlay
Guid overlayId = addOn.ActiveElementsOverlayAdd(elements, 
    new ActiveElementsOverlayRenderParameters()
    {
        ZOrder = -10000,  // Tried: -10000 to 1000 - overlay still renders in front
        FollowDigitalZoom = true,
        ShowAlways = true
    });

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How can I make overlays render visually behind the Digital Zoom control?
Does ZOrder only affect overlay-to-overlay ordering?

Thanks!

4

Milestone Development will start an investigation. Let me get back to you when there is a news from them.

5

For our investigation. Do you use XProtect Smart Client 2025R3? If not, please state the version.

6

I am currently using XProtect Smart Client 2025 R1.

8

Yes.

In our investigation we found that you cannot. This was however judged to be a bug. Milestone Development have now developed a fix which will be in the next Smart Client version when it is released.