Toolbars Toolbars define a bar of buttons that appears at the top of application forms. Understanding toolbars This is an introduction to toolbars definition. Defining toolbars in the form file Toolbars can be defined in the form specification file within the TOOLBAR section. Syntax of a toolbar file (.4tb) A .4tb toolbar file is an XML file that holds a tree of elements defining a toolbar structure. Loading a toolbar from an XML file Toolbar XML definition files can be loaded at runtime. Loading a default toolbar from an XML file To load a default toolbar from an XML definition file, use the utility method provided by the ui.Interface built-in class. Creating the toolbar manually with DOM Toolbars can be created at runtime by creating the corresponding XML representation in the AUI tree. Toolbars on mobile devices Toolbars can be used to control action view rendering on mobile devices. Examples Toolbar usage examples.