To copy the default styles, load your project in Expression Blend and open the User Control that holds the RadGridView. In the 'Objects and Timeline' pane select the RadGridView you want to style. From the menu choose Object -> Edit Style -> Edit a Copy. You will be prompted for the name of the style and where to be placed.

Tip
If you choose to define the style in Application, it would be available for the entire application. This allows you to define a style only once and then reuse it where needed.

After clicking 'OK', Expression Blend will generate the default style of the RadGridView control in the Resources section of your User Control. The properties available for the style will be loaded in the 'Properties' pane and you will be able to modify their default values. You can also edit the generated XAML in the XAML View or in Visual Studio.

• GridView_GroupPanelOuterBorder - a brush, that represents the outer border color of the Group Panel.
• RadGridViewTemplate - the ControlTemplate, applied to the RadGridView.
• ControlBackground - a brush that represents the background color of the RadGridView.
• ControlOuterBorder - a brush that represents the outer border color of the RadGridView.
• ControlForeground - a brush that represents the foreground color of the RadGridView.
• Item_AlternateBackground - a brush that represents the background color of the alternating rows.
• GridView_GroupPanelBackground - a brush that represents the background color of the Group Panel.
• GridView_GroupPanelForeground - a brush that represents the foreground color of the Group Panel.
• RadGridViewStyle - the Style, applied to the RadGridView control.