Hi Rick,

I whipped up some quick sample code for you.

this.ultraTree1.CreationFilter = new MyCreationFilter();

public class MyCreationFilter : IUIElementCreationFilter
    {
        void IUIElementCreationFilter.AfterCreateChildElements(UIElement parent)
        {
            var nodeSelectableAreaUIElement = parent as NodeSelectableAreaUIElement;
            if (null == nodeSelectableAreaUIElement)
                return;

            var node = nodeSelectableAreaUIElement.GetContext(typeof(UltraTreeNode)) as UltraTreeNode;
            if (null == node)
                return;

            // If the node is collapsed, do nothing. 
            if (false == node.Expanded)
                return;

            // This is something of a hack. There's no way to determined whether an ImageUIElement
            // is for a RightImage, LeftImage, or the node's appearance. So I am getting the 
            // right edge of the TextUIElement here and then we will only remove image
            // elements that are to the right of it. 
            var textUIElement = parent.GetDescendant(typeof(TextUIElement)) as TextUIElement;
            int thresholdX = null != textUIElement ? textUIElement.Rect.Right : 0;

            // If the node is expanded, remove all of the images. 

            // Removing items from a collection inside a ForEach loop is not a good idea.
            // So instead, just build a list of the elements we want to remove. 
            List<UIElement> elementsToRemove = new List<UIElement>();
            foreach (UIElement element in parent.ChildElements)
            {
                if (element is ImageUIElement &&
                    element.Rect.Left >= thresholdX)
                {
                    elementsToRemove.Add(element);
                }
            }

            // Now remove the elements we marked for removal. 
            foreach (UIElement elementToRemove in elementsToRemove)
                parent.ChildElements.Remove(elementToRemove);
        }

        bool IUIElementCreationFilter.BeforeCreateChildElements(UIElement parent)
        {
            // do nothing.
            return false;
        }
    }

Hi Mike,

As I though more about it, I think that I may be able utilize the DrawFilter or Creation Filter to Hide the images.  Do you happen to have an example of how I would do this? I have not worked with the DrawFilter or CreationFilter before.

Rhanks,

rick

Thanks for the quick reply!

Rick