WPF设计器错误声明在应用StaticResource时,它“无法为自定义UserControl创建类型为…”的实例

我有个有趣的问题。我创建了一个WPF UserControl,其中包含一个使用模板的按钮:

<Button x:Name="btnStart" Template="{StaticResource RoundedGlassButton}" HorizontalAlignment="Right" VerticalAlignment="Top" Margin="4" Height="32" Background="DarkGreen" Foreground="White" Width="72" Content="Start" />

当我将UserControl放在父控件或窗体上时,设计器抛出错误, “无法创建类型为”“MyUserControl”“的实例。” 但是,虽然设计器无法工作,但应用程序仍将编译,我在运行时得到所需的结果。我已将问题缩小到应用于我的按钮的模板。当我删除模板时,设计器将工作:

<Button x:Name="btnStart" HorizontalAlignment="Right" VerticalAlignment="Top" Margin="4" Height="32" Background="DarkGreen" Foreground="White" Width="72" Content="Start" />

我到处都在使用这个模板,所以我知道它是有效的。它甚至适用于其他用户控件。我只是不明白为什么它在这个特定的用户控件中不起作用。

下面是模板的标记。就像我说的,不过,我用这个到处都没有问题。事实上,我甚至可以在其他用户控件中使用它。我只是不明白为什么它不适用于这个特定的代码。

    <ControlTemplate x:Key="RoundedGlassButton" TargetType="{x:Type Button}">
    <ControlTemplate.Resources>
        <Storyboard x:Key="Timeline1">
            <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="glow" Storyboard.TargetProperty="(UIElement.Opacity)">
                <SplineDoubleKeyFrame KeyTime="00:00:00.3000000" Value="1"/>
            </DoubleAnimationUsingKeyFrames>
        </Storyboard>
        <Storyboard x:Key="Timeline2">
            <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="glow" Storyboard.TargetProperty="(UIElement.Opacity)">
                <SplineDoubleKeyFrame KeyTime="00:00:00.3000000" Value="0"/>
            </DoubleAnimationUsingKeyFrames>
        </Storyboard>
    </ControlTemplate.Resources>
    <Border BorderBrush="#FF888888" BorderThickness="1,1,1,1" CornerRadius="4">
        <Border x:Name="border" Background="{TemplateBinding Background}" BorderBrush="#FF000000" BorderThickness="1,1,1,1" CornerRadius="4">                
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="0.507*"/>
                    <RowDefinition Height="0.493*"/>
                </Grid.RowDefinitions>
                <Border Opacity="0" BorderThickness="2" BorderBrush="White" HorizontalAlignment="Stretch" x:Name="glow" Width="Auto" Grid.RowSpan="2" CornerRadius="4">
                    <Border.BitmapEffect>
                        <BlurBitmapEffect Radius="2" />
                    </Border.BitmapEffect>                       
                </Border>
                <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" Width="Auto" Grid.RowSpan="2" SnapsToDevicePixels="True" />
                <Border HorizontalAlignment="Stretch" Margin="0,0,0,0" x:Name="shine" Width="Auto" CornerRadius="4,4,8,8">
                    <Border.Background>
                        <LinearGradientBrush EndPoint="0.494,0.889" StartPoint="0.494,0.028">
                            <GradientStop Color="#AAFFFFFF" Offset="0"/>
                            <GradientStop Color="#33FFFFFF" Offset="1"/>
                        </LinearGradientBrush>
                    </Border.Background>
                </Border>
            </Grid>
        </Border>
    </Border>
    <ControlTemplate.Triggers>
        <Trigger Property="IsPressed" Value="True">
            <Setter Property="Opacity" TargetName="shine" Value="0.4"/>
            <Setter Property="Background" TargetName="border" Value="#CC000000"/>
            <Setter Property="Visibility" TargetName="glow" Value="Hidden"/>
        </Trigger>
        <Trigger Property="IsMouseOver" Value="True">
            <Trigger.EnterActions>
                <BeginStoryboard Storyboard="{StaticResource Timeline1}"/>
            </Trigger.EnterActions>
            <Trigger.ExitActions>
                <BeginStoryboard x:Name="Timeline2_BeginStoryboard" Storyboard="{StaticResource Timeline2}"/>
            </Trigger.ExitActions>
        </Trigger>
    </ControlTemplate.Triggers>
</ControlTemplate>

也就是说,如果有人对问题的起因有任何想法,我们仍然会感激任何帮助。