Reference : Attribute types : Heading
  
Heading
A heading is an attribute that consists of a title, color, and an expand or collapse control. It is used primarily for layout purposes. If you set the heading attribute to a specific color, all of the attributes below the heading (until the next heading) have the selected color.
Heading settings
Heading attributes contain titles. You can use this attribute for layout and to group the attributes in an element. The heading attribute is useful when an element has many attributes.
 
Setting
Description
Background Color
A number of colors are available to choose from. The default value is dark blue.
Default Collapsed
If this checkbox is selected, the attributes between the specific heading and the next heading are hidden. You can display the attributes by expanding the heading.
See also
Attribute types