Themes
This help article will demonstrate a step by step tutorial how to customize the ControlDefault theme for RadVirtualKeyboard
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 ToggleKey in Controls Structure on the left side. The ToggleKey in the Elements section is also selected.
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Expand the ToggleKey Element and modify the applied BackColor property and set the GradientStyle to Solid for the ToggleState=On Element State.
Save the theme by selecting File >> Save As.
Now, you can apply your custom theme to RadVirtualKeyboard by using the demonstrated approach in the following link: Using custom themes