I used the following code to show tooltip. It works fine with text but not for image cell. Looks like it was due to element == null. How to make it work for image cell? Thanks.
private void ultraTree1_MouseEnterElement(object sender, UIElementEventArgs e)
{
EditorWithTextUIElement element = e.Element as EditorWithTextUIElement;
if (element != null)
)
EditorWithTextUIElement is the edit element for text cells. So if you want an element that exists for every cell, then you should use UltraTreeNodeCellUIElement.
You might want to download the Infragistics UIElementViewer Utility. It will help a lot when working with UIElements like this.