WPF Expender Control

The Expander control is like a GroupBox. It derives from HeaderedContentControl, so it has a Header property to set the header content, and a Content property for the expandable content.
It has an IsExpanded property to get and set the expanded or collapsed state.
  1. <Grid>
  2. <Expander Header="Select Answer">
  3. <StackPanel Margin="15,5,0,0">
  4. <CheckBox Margin="5" Content="One" />
  5. <CheckBox Margin="5" Content="Two" />
  6. <CheckBox Margin="5" Content="Three" />
  7. <CheckBox Margin="5" Content="Four" />
  8. </StackPanel>
  9. </Expander>
  10. </Grid>