Themes
This help article will demonstrate a step by step tutorial how to customize the ControlDefault theme for RadGroupBox.
Open VisualStyleBuilder.
Export the built-in themes. in a specific folder by selecting File >> Export Built-in Themes.
Load a desired theme from the just exported files by selecting File >> Open Package
Navigate to RadGroupBox in
Controls Structure
on the left side. Then, expand to and select GroupBoxElement.Modify the applied fill repository item.
Save the theme by selecting File >> Save As.
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Now, you can apply your custom theme to RadGroupBox by using the approach demonstrated in the following link: Using custom themes