Hi,

This is not the most efficient code, but you could do it using UIElements:

        private bool IsOverflowIndicatorVisible(UltraTextEditor ultraTextEditor)
        {
            // Force a paint to make sure the UIElement tree is up-to-date. 
            ultraTextEditor.Update();

            // Get the control UIElement. 
            UIElement element = ultraTextEditor.UIElement;

            // See if there is a EditorWithTextOverflowIndicatorUIElement
            element = element.GetDescendant(typeof(EditorWithTextOverflowIndicatorUIElement));
            return element != null;
        }