WPF Как увеличить окно программы, по нажатии кнопки?

Пробовал через c# не помогло. Можно ли как то увеличить в разметке ?

 <Button Height="22" Width="23" 
                   VerticalAlignment="Top"
                   HorizontalAlignment="Right"                    
                   Margin="0 9 40 0" 
                   ToolTip="Развернуть"
                    Background="#CEE3FF"
                    BorderThickness="0"
                    Name="btnExpand"
                    Click="btnExpand_Click">

                <Image Style="{StaticResource Expand}">
                    
                    
                </Image>
            </Button>

Полный код разметки вот

<Window x:Class="Librarian.Windows.StartWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:local="clr-namespace:Librarian.Windows"
    mc:Ignorable="d"
    Height="450" Width="800"
    WindowStartupLocation="CenterScreen"
    WindowStyle="None"
    MouseLeftButtonDown="Window_MouseLeftButtonDown"
    AllowsTransparency="True" Background="Transparent" ResizeMode="CanResizeWithGrip" x:Name="windowMain">

<Border BorderBrush="#FF42C4EB" BorderThickness="2"
        CornerRadius="20,20,20,20" x:Name="borderMain">

    <Border.Background>

        <LinearGradientBrush>
            <GradientBrush.GradientStops>
                <GradientStopCollection>
                    <GradientStop Color="#E7EBF7" Offset="0.0"></GradientStop>
                    <GradientStop Color="#CEE3FF" Offset="0.5"></GradientStop>
                </GradientStopCollection>
            </GradientBrush.GradientStops>
        </LinearGradientBrush>

    </Border.Background>

    <Grid x:Name="gridMain">
        <Grid.RowDefinitions>
            <RowDefinition Height="98"/>
            <RowDefinition/>
            <RowDefinition Height="39"></RowDefinition>
        </Grid.RowDefinitions>

        <Grid Grid.Row="0">

            
            
            <Image Source="/Resources/logo/logo.png" 
                   HorizontalAlignment="Left"
                   VerticalAlignment="Top"
                   Height="30" Width="28"
                   Margin="10,10,0,0">

            </Image>

            <Image MouseLeftButtonDown="Exit_MouseLeftButtonDown" Name="Exit"                      
                   VerticalAlignment="Top"
                   HorizontalAlignment="Right"                    
                   Margin="0 10 10 0" 
                   Style="{StaticResource Cross}"
                   ToolTip="Закрыть">
            </Image>

            <Button Height="22" Width="23" 
                   VerticalAlignment="Top"
                   HorizontalAlignment="Right"                    
                   Margin="0 9 40 0" 
                   ToolTip="Развернуть"
                    Background="#CEE3FF"
                    BorderThickness="0"
                    Name="btnExpand"
                    Click="btnExpand_Click">

                <Image Style="{StaticResource Expand}">
                    
                    
                </Image>
            </Button>

            <Image Style="{StaticResource RollUp}"
                    VerticalAlignment="Top"
                   HorizontalAlignment="Right"                    
                   Margin="0 9 70 0" 
                   Name="rollUp"
                   MouseLeftButtonDown="rollUp_MouseLeftButtonDown">
                
                
            </Image>
            
            


        </Grid>

        <Grid Background="#B5CBEF" Grid.Row="1">




        </Grid>

        <Grid Grid.Row="2">

            <TextBlock Margin="12" Grid.Row="2">My Footer</TextBlock>

        </Grid>

    </Grid>
</Border>

И последний вопросик. Как свернуть программу в нормальные размеры, и как свернуть вообще ?