Themes
This help article will demonstrate a step by step tutorial how to customize the ControlDefault theme for RadDomainUpDown.
Open VisualStyleBuilder: Start menu (Start >> Programs >> Telerik >> UI for WinForms [version] >> Tools).
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
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Select UpButton in Controls Structure on the left side. Then, select RadArrowButtonImage in the Elements section.
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Modify the applied image repository item and select the desired image for the up button.
You can follow a similar approach for the DownButton.
Save the theme by selecting File >> Save As.
Now, you can apply your custom theme to RadDomainUpDown by using the demonstrated approach in the following link: Using custom themes