How can I change the TreeView Icon into a folder icon?

Question

I\'m trying to change the icon of my TreeView in a folder icon. Also when it collapses it needs to have an opened folder icon.

My treeview has databound items in it and

Answer 1

Incidentally i did something like this just a few days ago. In my application a folder icon is added in the HierarchicalDataTemplate to those objects which behave like folders, i use a trigger to change the icon based on whether the item is expanded or not, here's the relevant bit of XAML:

Where {StaticResource Icon_FolderOpen} and {StaticResource Icon_FolderClosed} are BitmapImages that hold the icons for the folder states. IconImageStyleSmall is a style which sets the MaxWidth and MaxHeight of the images to something appropriate.

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Edit: For completion's sake.

Icons used