wpf loading加载等待

<Window x:Class="Microsoft.Samples.Kinect.InteractionGallery.LoadImageWindow" 
        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" 
        x:Name="Window" Title="ImageFile加载提示框"
        Width="480" Height="320" ResizeMode="NoResize"
        Icon="Icon.ico"
        Closed="LoadImageWindow_OnClosed"
        mc:Ignorable="d">
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    <Window.Triggers>
        <EventTrigger RoutedEvent="FrameworkElement.Loaded">
            <BeginStoryboard Storyboard="{StaticResource Storyboard1}" />
        </EventTrigger>
    </Window.Triggers>

    <Grid x:Name="LayoutRootGrid" Background="CadetBlue">
        <Viewbox Width="8" Height="8">
            <Grid HorizontalAlignment="Center" x:Name="loading" Margin="0" VerticalAlignment="Center" Width="3.333" Height="3.333" Visibility="Visible">
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                <Ellipse RenderTransformOrigin="0.5,0.499" x:Name="ellipse_Copy" Fill="#FFFFFFFF" Stroke="{x:Null}" Margin="-0.012,0,0.001,-9.67" VerticalAlignment="Bottom" Height="3.344">
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                <Border RenderTransformOrigin="0.492,1.006" Margin="1.081,0,1.086,-8.056" x:Name="border" VerticalAlignment="Bottom" Height="8.622" Background="#FFFFFFFF" CornerRadius="1,1,0,0">
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                <Border Height="4.994" Background="#FFFFFFFF" CornerRadius="1,1,0,0" RenderTransformOrigin="0.496,1.001" Margin="0.705,0,0.714,-8.058" x:Name="border1" VerticalAlignment="Bottom">
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            </Grid>
        </Viewbox>
        <Label x:Name="LoadingLabel" Content="正在努力加载ImageFile文件夹，请稍候..." Visibility="Hidden" Margin="122,70,70,70"/>
        <StackPanel x:Name="ButtonStackPanel" Orientation="Horizontal"  HorizontalAlignment="Center">
            <Button x:Name="LoadButton" Click="LoadButton_OnClick" Content="加 载" FontSize="18" Width="100" Height="100" />
            <Button x:Name="UnLoadButton" Click="UnLoadButton_OnClick"  Content="跳 过" FontSize="18" Width="100" Height="100"/>
        </StackPanel>
        <Label Content="说明：如果您的ImageFile文件夹已变动或是新的，请点击加载，否则跳过。" Margin="0,257,0,0"/>
    </Grid>
</Window>