Wpf 如何以编程方式将带有textblock的装饰器添加到画布？

下面是一个包含此xaml的代码示例，但是如何以编程方式构造此示例并将其添加到画布

<custom:BalloonDecorator Background="{StaticResource MessageOutBackground}" PointerLength="10"
CornerRadius="5" Margin="10,0,0,0"
HorizontalAlignment="left">
<Border Background="{StaticResource Hilight}" CornerRadius="5">
<Border Background="{StaticResource HilightBottom}"
CornerRadius="5">
<TextBlock Text="Hello" HorizontalAlignment="Left" VerticalAlignment="Top"/>
</Border>
</Border>
</custom:BalloonDecorator>

---

将其作为窗口的资源（或其他资源）：

---

但是我如何以编程方式装饰文本块呢？类似于myTextBlock.style=myDecorator？不，只需搜索互联网：（您可能应该为此定义一个自定义用户控件）

<Window.Resources>
    <custom:BalloonDecorator x:Key="MyDecorator" Background="{StaticResource MessageOutBackground}" PointerLength="10"
    ...
    </custom:BalloonDecorator>
</Window.Resources>

BalloonDecorator myDecorator = FindResource("MyDecorator") as BalloonDecorator;