The IMAGEEXPANDED attribute sets the global icon to be used when a tree node is expanded.
IMAGEEXPANDED = "image-name"
This attribute is used in the definition of a TREE container, to define the icon to be used for nodes that are expanded.
It overwrites the program array image defined by IMAGECOLUMN, if both are used.
This attribute is optional.
For more details about image resource specification, see Providing the image resource.