Hi Marc! What tcl-tk theme are you using? Autodetection supposed to fetch color from TreeView background, and probably your theme using that odd gray for TreeViews. To set your desired color for background, you can add *Text.Background: white to ~/.Xresources; and `xrdb -merge ~/.Xresources` to apply it. Or, try another theme. This one gives me white background. *TkTheme: clam To list available themes, run `wish` ::ttk::themes -- Regards, Serg Tereshchenko