Customising expander icons in treeview

[Kamalpreet Grewal <grewalkamal005 gmail com>]

Hello all

As we all know that in a treeview, rows can be added in hierarchy. To
expand, there are small triangles (arrows) clicking any of which the
row expands/collapses.

If I wish to customise these arrows for my application and use some
different icons as expander arrows, how can it be done?

Thanks in advance.

-- 
Kamalpreet Kaur Grewal
Blog: http://kamalpreetgrewal.com/