Hello Pradeep Enugala,
Thank you for writing.
In order to apply custom settings to the application button, you need to create a theme for RadApplicationMenu. It is the first control in VisualStyleBuilder.
RadRibbonForm does not currently support setting a background image through a theme. You can however add a panel to your form and set a background image to it instead.
Please write again if you have other questions.
Regards,
Victor
the Telerik team
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