
What's the point? Well now you don't have to fudge with magic pink and jaggies. You can use more transparency and the buttons will be perfectly blended with whatever happens to be in the background.
I though I had updated my guide to modding logon screens to include this. But apparently not. I will update it ASAP. In the meantime - if you use ResEdit - you can just use your own 32 bit images for the controls.
**Edit**. OK updated guide: http://www.jools.net/resources/logon-uifile-secrets/