#Toolbox controls

The UIToolbox namespace has controls that UI Toolkit does not have. They work in any panel, with or without a workspace:

• When a toolbox control attaches to a panel, it adds UIToolbox/Themes/dark (the base palette) and UIToolbox/Styles/Controls to the panel root.
• Inside a workspace, the control gets the workspace theme, because the theme variables inherit.
• Their rules use only the --tb-* variables. See Theme variables. The classes of a control are in the Styling section of its document.
• A control that uses the arrow directions acts on the NavigationMoveEvent, not on an arrow KeyDownEvent. At runtime the arrow keys and the gamepad directions both send it, so a gamepad changes the value too. ToolboxNavigation.RegisterMove keeps the focus on the control only for the directions that it uses; the other directions and Tab move the focus as usual.