Using a style

To apply a specific style, set the style-name in the style attribute of the node representing the graphical element in the abstract user interface tree.

There are different ways to set the style attribute of an element:

As a form element attribute, with a STYLE attribute in the form specification file.
In the ATTRIBUTES clause of instructions such as OPEN WINDOW, MESSAGE, ERROR.
Dynamically by a program, using the ui.Form.setElementStyle() method.

For example, to define a style in a form file for an input field:

EDIT f001 = customer.fname, STYLE = "info";

Note: The string used to define the STYLE attribute must be a style-name only, it must not contain the element-type that is typically used to define the style in a .4st file (as CheckBox.important for example)