The control includes several built-in themes you can use to style your application. For more information about available styles, see Themes. You can easily change the theme n Design view.
From the Tasks Menu
You can access themes from the C1Expander Tasks menu:
The style you choose will be applied to the control.
From the Properties Window
You can select a theme to apply from the Properties window:
The Visual Style you chose will be applied to the C1Expander control.