The reason for the different header color of RadWindow is that in our WPF demos is changed the AccentBrush of the Windows8 theme to the following:
Windows8Palette.Palette.AccentColor = Color.FromArgb(0xFF, 0x79, 0x25, 0x6B);
The Windows8 and Windows8 Themes support dynamic resources, so you can easily modify the colors of the theme using the demonstrated approach above. For more details about the theme and the dynamic resources, please check the following article from our online help documentation:
Hope this helps.
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