How to Create and Assign a Sub-theme
/documentation/pages/HowTo/Styling Applications/Add a subtheme.xml

Sub-themes are reusable style definitions for controls.

Panel Layout Properties
/documentation/pages/Guides/Mobile and Web Components/UX/Controls/Props/panel/Panel Layout Properties/index.xml
Panel Layouts are containers that can contain Panels, Panel Navigators, and even other Panel Layout containers. The Panel Layout Properties section allows you to define how the sub-containers inside a panel layout will act. For example, the direction that the containers will flow in, what method of animation will be used to display panels, what buttons reveal hidden panels, and more.
Local sub-theme definitions - CSS
/documentation/pages/Guides/Mobile and Web Components/UX/Properties/UX_Properties/Local subtheme definitions CSS.xml
Define the CSS for any locally defined sub-themes. Sub-themes are used to create a custom appearance for certain types such as windows, buttons, tabs, accordions, sliders, switches, etc.
Web Theme Builder
/documentation/pages/Guides/Workspaces/CSS_SVG/Web Theme Builder.xml
The Web Theme Builder (also referred to as the Stylesheet Builder, Style Builder, or Web Style Builder within Alpha Anywhere) is used to create and modify Web Themes, which are used to style applications in Alpha Anywhere
UX Component - User-Defined Sub-Themes
/documentation/pages/Guides/Mobile and Web Components/UX/Code/Javascript In UX Components/User-Defined Sub-Themes.xml
Most of the Javascript controls on a UX component support the concept of 'sub-themes'. This topic discusses how user-defined sub-themes can be added to a UX component.
Style sub-theme and CSS 'tweaks'
/documentation/pages/Guides/Mobile and Web Components/UX/Properties/UX_Properties/Style subtheme and CSS tweaks.xml
Define style tweaks, sub-theme, or CSS to augment or override definitions in the web theme.
Panel Layout HTML
/documentation/pages/Guides/Mobile and Web Components/UX/Properties/Panel Layout HTML/index.xml
Determines when the HTML for Panels is computed.
Local sub-theme definitions - Javascript
/documentation/pages/Guides/Mobile and Web Components/UX/Properties/UX_Properties/Local subtheme definitions Javascript.xml
Define the Javascript for any locally defined sub-themes. Sub-themes are used to create custom appearance of certain control types such as windows, buttons, tabs, accordions, sliders. switches, etc.
Panel Card Properties
/documentation/pages/Guides/Mobile and Web Components/UX/Controls/Props/panel/Panel Card Properties/index.xml
A Panel Card can be added to component through the 'Panels' menu. Panel cards are useful for defining the different screens, or panels, that a user will see as they navigate through an application on a mobile device. If panel cards are being used inside a component, then every control in that component must be inside a specified panel card. Panel card's come with their own set of properties, listed here:
Open a Page Layout component
/documentation/pages/Ref/Action Javascript/Open a Page Layout component.xml
Open a Page Layout component in a pop-up window, or in a DIV on the current page.