#510 – The Header of an Expander Can Be Anything

The Header property of an Expander control doesn’t have to be a string.  You can set it to any object and that object will be displayed at the top of the Expander, whether the Expander is collapsed or expanded.

In the example below, we use an Image for the header of the Expander and then a GroupBox for its content.

        <Expander Margin="10" >
            <Expander.Header>
                <Image Source="Images/CptBlood-1935.png" Width="51" Height="72"/>
            </Expander.Header>
            <GroupBox Header="More Info">
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition/>
                        <RowDefinition/>
                        <RowDefinition/>
                        <RowDefinition/>
                    </Grid.RowDefinitions>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition/>
                        <ColumnDefinition/>
                    </Grid.ColumnDefinitions>

                    <Label Grid.Row="0" Grid.Column="0" Content="Title" FontWeight="Bold" HorizontalAlignment="Right"/>
                    <Label Grid.Row="0" Grid.Column="1" Content="Captain Blood"/>

                    <Label Grid.Row="1" Grid.Column="0" Content="Year" FontWeight="Bold" HorizontalAlignment="Right"/>
                    <Label Grid.Row="1" Grid.Column="1" Content="1935"/>

                    <Label Grid.Row="2" Grid.Column="0" Content="Director" FontWeight="Bold" HorizontalAlignment="Right"/>
                    <Label Grid.Row="2" Grid.Column="1" Content="Michael Curtiz"/>

                    <Label Grid.Row="3" Grid.Column="0" Content="Star" FontWeight="Bold" HorizontalAlignment="Right"/>
                    <Label Grid.Row="3" Grid.Column="1" Content="Errol Flynn"/>
                </Grid>
            </GroupBox>
        </Expander>

The Expander starts out collapsed:

Then shows GroupBox when expanded: