Hue-saturation pad is non-linear in HLS mode. the behavior is different when mowing the color circle and using the pad.

when the slider of the LuminancePad is at its minimum or maximum the control visualized wrong color. 

TextBlocks RGB CMYK HSL are cut when the style is extracted from blend. 

As a workaround use an implicit style approach. You can have folder with your XAML files and edit the Style of RadColorEditor in them.
http://docs.telerik.com/devtools/wpf/styling-and-appearance/styling-apperance-implicit-styles-overview

TextBlocks RGB CMYK HSL are cut when the style is extracted from blend.

DECLINED: Duplicated with https://feedback.telerik.com/Project/143/Feedback/Details/121916-coloreditor-issues-when-the-style-is-extracted-from-blend-and-used