ZoomWindow.xaml

<Window x:Class="WpfDemo.ZoomWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Height="120" Width="260" Title="ZoomImage" WindowStartupLocation="CenterOwner" ResizeMode="CanMinimize">
    <Grid>
        <Label Margin="25,10,0,0" Name="label1" Height="28" VerticalAlignment="Top" HorizontalAlignment="Left">Zoom Ratio:</Label>
        <TextBox Margin="100,13,0,0" Name="tbRatio" Height="22" VerticalAlignment="Top" HorizontalAlignment="Left" Width="40" TextAlignment="Center"/>
        <Label Margin="140,10,0,0" Name="label2" Height="28" VerticalAlignment="Top" HorizontalAlignment="Left">%</Label>
        <Label Margin="160,10,0,0" Name="label3" Content="(2%~6500%)" Height="28" VerticalAlignment="Top" HorizontalAlignment="Left"/>

        <Button Margin="35,0,0,15" Name="button1" Click="OK_Click" Height="23" VerticalAlignment="Bottom" HorizontalAlignment="Left" Width="74">OK</Button>
        <Button Margin="0,0,31,15" Name="button2" Click="Cancel_Click" Height="23" VerticalAlignment="Bottom" HorizontalAlignment="Right" Width="74">Cancel</Button>
        <Label Margin="0,30,0,28" Name="lbHint" FontSize="11" Foreground="Red" VerticalAlignment="Top" HorizontalAlignment="Center"/>
    </Grid>
</Window>