The ExpandableSection components provides a tweakable icon that the user can use to hide or show content within the section. If you have ever used Lotus Notes, you'll have seen this idea before.
The ExpandableSection is in fact using another component internally called a TitleBar. This class provides the title across the top and also the expandable icon on the left. It is responsible for handling the expand/collapse events as well.
Any content at all can be placed within ExpandableSection. Usually you would group the content in a container like component such as a Panel.
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