This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.1)


represents an opener with setting x, displayed as when x is True and when x is False.
takes the setting to be the dynamically updated current value of x, with the value of x being toggled if the opener is clicked.
Dynamically change a variable:
Dynamically change a variable:
Click for copyable input
Change the appearance:
By default the opener changes only when you click it:
By setting AutoAction, the opener toggles as the mouse moves over the opener area:
Change the background color:
Align with surrounding text:
By default Opener is enabled:
By setting Enabled->False, the opener is disabled but visible in its current state:
Include margins around the Opener:
Use Opener with PaneSelector for hiding and exposing additional controls:
Opener is a special case of Toggler:
OpenerView is a combination of Opener and PaneSelector:
New in 6