tree-widget-set-theme

tree-widget-set-theme is a compiled Lisp function in `tree-widget.el'.

(tree-widget-set-theme &optional NAME)

In the current buffer, set the theme to use for images.
The current buffer must be where the tree widget is drawn.
Optional argument NAME is the name of the theme to use. It defaults
to the value of the variable `tree-widget-theme'.
Does nothing if NAME is already the current theme.

If there is a "tree-widget-theme-setup" library in the theme
directory, load it to setup a parent theme or the images properties.
Typically it should contain something like this:

(tree-widget-set-parent-theme "my-parent-theme")
(tree-widget-set-image-properties
(if (featurep 'xemacs)
'(:ascent center)
'(:ascent center :mask (heuristic t))
))