All widgets in OutSystemsUI have "ExtendedClass" property, which can be used to apply changes to the style of the widget.

However, some widgets inject a secondary element to the body of the HTML page. These elements do not inherit the "ExtendedClass", thus if a developer wants to style the element, he/she must apply a change to all said elements.

For example, a timepicker adds the popover time select menu in the body, not inside the timepicker tag in the HTML tree.

If the popover element has the added "ExtendedClass", the specific element related to the selected widget, can be targeted, and only it be affected by the new style.