The glyph skinning feature allows you to fill button glyphs using a hue specified by the FlyoutPanel's foreground color (the FlyoutPanel.Appearance.ForeColor property).
For the best visual results, we recommend using grayscale icons with the glyph skinning feature. The DevExpress Image Gallery and Context-Dependent Images provides a set of grayscale icons, which can be freely used in your application.
See the Glyph Skinning topic to learn more.