Hi!

I created a CreationFilter for UltraTree that does the following:

1. Makes the TreeNode Area wider and higher and moves it a bit left, so I would get a nicer looking selectable area:

2. Adds a button to the top-Node of the Tree as a child control:

All is well, but strangely if I use both components together, I can't get OnHover action of the button anymore and to activate it I need to click two times.

Here is the CreationFilter code:

private void OffsetElements(UIElement parent)
        {
            if (parent is TreeNodeUIElement)
            {
                Rectangle newRect = parent.Rect;
                newRect.Width = parent.Control.Width;
                newRect.Height = 23;
                newRect.X = 0;
                parent.Rect = newRect;

                foreach (UIElement child in parent.ChildElements)
                {
                    int nLevel = (parent as TreeNodeUIElement).Node.Level;
                    Rectangle newRectChild = child.Rect;
                    newRectChild.X = newRectChild.X + nLevel * 19;
                    child.Rect = newRectChild;
                }

                CreateButton(parent);
            }
        }

        private void CreateButton(UIElement parent)
        {
            if ((parent as TreeNodeUIElement).Node.Level != 0)
                return;

            Appearance app = new Appearance
            {
                BackColor = Color.Transparent,
                ImageBackground = Properties.Resources.Cog_12x12,
                ImageBackgroundStyle = ImageBackgroundStyle.Centered,
                AlphaLevel = 0
            };

            ButtonUIElement oButtonNode = new ButtonUIElement(parent);
            oButtonNode.ElementClick += new UIElementEventHandler(button_ElementClick);
            parent.ChildElements.Add(oButtonNode);

            int x = parent.Rect.Width - 30;
            int y = parent.Rect.Y;

            Rectangle rectangle = new Rectangle(new Point(x, y), new Size(parent.Rect.Height, parent.Rect.Height));
            oButtonNode.Rect = rectangle;
            oButtonNode.Appearance = app;
        }

Could you hint me what am I doing wrong?