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Columns
Using the Columns property you can organize the colors in the palette so they are rendered in appropriate color groups. By default, setting a Preset will automatically set the appropriate Columns property value so that the preset palette is rendered correctly. If you have a custom color collection, you can arrange the colors by setting the appropriate Columns property value.
ASP.NET
<telerik:RadColorPicker RenderMode="Lightweight" runat="server" ID="RadColorPicker1" Preset="Grayscale" />
Displays as:
ASP.NET
<telerik:RadColorPicker RenderMode="Lightweight" runat="server" ID="RadColorPicker1" Preset="Grayscale" Columns="8"/>
Displays as: