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Wow.And to think I just used to write bitmap.MakeTransparent(bitmap.GetPixel(0, 0)); Still, that's progress for you. Thanks for the info, I'll give it a try.

Thanks for that. With Windows Forms etc it was easy just bitmap.MakeTransparent(bitmap.GetPixel(0, 0)); and I'm sure Bitblt would do it but I always try and avoid unmanaged code as it seems like such a backward step especially with WPF and XAML on the horizon.

Believe me, it's not easy. I've been 'playing' trying to create a user control that mimics an Outlook navigation pane and so far it's taken me 2 weeks to just get the layout 75% right. Trying to do layout in code (C# or XAML) is long winded and error prone. Which leaves the VS Designer which seems far from finished.

Does anyone know how you select a pixel from a BitmapImage instance, say the one at 0.0, and set that as the transparent color for a bitmap.