Expander allows you to create customized and rich applications. Make the most of Expander by taking advantage of the following key features:

• Expand Direction
  The Expander control has the ability to expand in four different directions, namely Top, Right, Bottom, and Left. This allows you to change the direction in which the control expands. For more information, see the Expand Direction topic.
• Custom Header
  The Expander control's header can be easily customized by adding some text or controls in it. For more information on the expander header, see Header. 
• Control Expandability
  Choose whether or not the Expander control is expanded upon page load by simply using a single property. For more information, see the Expandability topic.
• Configure Items in an Organized Pattern
  Expander is designed to maximize space. Configure the size and position of the expander to hide items until needed.