WPF Expender Control

The Expander control is like a GroupBox. It derives from HeaderedContentControlso it has a Header property to set the header content, and a Content property for the expandable content.

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.

<Grid>
    <Expander Header="Select Answer">
        <StackPanel Margin="15,5,0,0">
            <CheckBox Margin="5" Content="One" />
            <CheckBox Margin="5" Content="Two" />
            <CheckBox Margin="5" Content="Three" />
            <CheckBox Margin="5" Content="Four" />
        </StackPanel>
    </Expander>
</Grid>