win form treeview image

Hi,
A treeview control is populated with data
i.e.:
item1
subitem1
subitem2
...

Not sure why when I click on a subitem, the image changes. There are no events that fire this.
When assigning the images, I do assign using imageindex and selectedimageindex

Note that clicking on the parent i.e. the item does NOt change the image whereas clicking on the subitem does.

Do you know why this is occuring please?
Thanks

Presumably you've assigned different values to the ImageIndex and SelectedImageIndex properties of the node.

I have checked and I have assigned the SAME image for both indeximage and selectedimageindex.
Still have the same problem.
Thanks