Hi, i needs Help C# WPS Expand

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C#

WPF

Hi,
i`m trying to my project. this is one of my project

i`m trying to use Expander, and i already make it but i want to try another way if i click Expander button window Height increase and show Expander and re click Expander, Height Decrease

this is my Source



http://image.kilho.net/?pk=1217291[^]

<Window x:Class="WpfApplication29.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="A" Height="308.421" Width="611.579" removed="#1F1F1F" WindowStyle="None" AllowsTransparency="True">
    <Grid Margin="0,0,2,0">
        <Grid removed="#FFC8EDFF" Height="20" Width="605" HorizontalAlignment="Left" VerticalAlignment="Top" MouseLeftButtonDown="Window_Move">
    
        </Grid>
       
        <Grid Margin="3,25,-3,0">
            <Rectangle Fill="#FFF4F4F5" HorizontalAlignment="Left" Height="219" Stroke="Black" VerticalAlignment="Top" Width="575" Margin="14,9,0,0"/>

            <Label Content="A :" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="28,19,0,0" FontSize="12"/>
            <TextBox HorizontalAlignment="Left" Height="23" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="120" Margin="109,22,0,0"/>

            <Label Content="B " HorizontalAlignment="Left" VerticalAlignment="Top" Margin="28,59,0,0" FontSize="12"/>
            <TextBox HorizontalAlignment="Left" Height="23" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="120" Margin="109,59,0,0"/>

            <Label Content="C :" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="28,100,0,0" FontSize="12"/>
            <TextBox HorizontalAlignment="Left" Height="23" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="120" Margin="109,103,0,0"/>


            <Label Content="F :" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="307,19,0,0" FontSize="12"/>
            <TextBox HorizontalAlignment="Left" Height="23" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="120" Margin="427,21,0,0"/>

            <Label Content="G :" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="307,59,0,0"/>
            <ComboBox HorizontalAlignment="Left" VerticalAlignment="Top" Width="120" Margin="439,59,0,0" FontSize="12"/>

            <Label Content="H :" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="307,100,0,0" FontSize="12"/>
            <ComboBox HorizontalAlignment="Left" VerticalAlignment="Top" Width="120" Margin="439,104,0,0"/>

            
            <Button Content="OK" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="500,244,0,0" FontSize="12"/>




            <Expander Header="Expander" Width="580" Height="280" Foreground="#FF2DAE34" ExpandDirection="Up" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="14,0,0,0">
                <Grid Width="580" Height="250"  removed="#FFE5E5E5" Margin="0,0,-2,0">
                    <Button Content="Apply" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="335,10,0,0"/>
                    <Button Content="Del" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="415,10,0,0"/>
                    <Button Content="Cancel" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="495,10,0,0"/>
                    <ListView HorizontalAlignment="Left" Height="188" VerticalAlignment="Top" Width="560" Margin="10,42,0,0">
                        <ListView.View>
                            <GridView>
                                <GridViewColumn Width="60" Header="A"/>
                                <GridViewColumn Width="60" Header="B"/>
                                <GridViewColumn Width="60" Header="C"/>
                                <GridViewColumn Width="80" Header="D"/>
                                <GridViewColumn Width="60" Header="E"/>
                                <GridViewColumn Width="80" Header="F"/>
                                <GridViewColumn Width="80" Header="G"/>
                                <GridViewColumn Width="80" Header="G"/>

                            </GridView>
                        </ListView.View>
                    </ListView>
                </Grid>



            </Expander>

        </Grid>
    </Grid>
</Window>

i want to use Expander to increase Layout Height and Collapse


but i couldn`t find it


is anyone know to use Expander to it? or Sample?