Users can create an expandable tab, that is, a tab that contains a button on the right side to expand the window and display more controls. The syntax is the same as the Custom type, but adds a class to the end of the declaration, as in the next syntax.

U=(XControl,Icon,Tip)|(ExpandedXControl,Size)

Consider the next example.

U=(custom.CustomDisplay1,custom.CustomIcon1,Here comes a custom tip)|(custom.CustomDisplay2,700x600)

In this case, a custom tab is displayed with the following features:

•The collapsed tab displays the CustomDisplay1 object, created in the custom.lib library

•This icon's tab is the CustomIcon1 object, created in the custom.lib library

•The button to open this tab contains a help text "Here comes a custom tip"

•This tab contains a command to expand the window

•The expanded tab displays the CustomDisplay2 object, created in the custom.lib library

•The window's with when expanding is 700 pixels, while its height is 600 pixels