add Magnifier doc
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title: Magnifier
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title: Magnifier 放大镜
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借助 `Magnifier` 可对任意控件局部放大.
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```cs
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[TemplatePart(Name = ElementVisualBrush, Type = typeof(VisualBrush))]
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public class Magnifier : AdornerElement
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```
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# 属性
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|属性|描述|默认值|备注|
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|HorizontalOffset|相对鼠标的水平偏移|0||
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|VerticalOffset|相对鼠标的垂直偏移|0||
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|Scale|缩放因子|5.0|||
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# 案例
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```xml
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<Image Margin="16" hc:Magnifier.Instance="{x:Static hc:Magnifier.Default}" Source="/HandyControlDemo;component/Resources/Img/b1.jpg" Stretch="None"/>
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```
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```xml
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<Image Margin="16" Source="/HandyControlDemo;component/Resources/Img/b1.jpg" Stretch="None">
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<hc:Magnifier.Instance>
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<hc:Magnifier Scale="6" HorizontalOffset="-16" VerticalOffset="-16"/>
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</hc:Magnifier.Instance>
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</Image>
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```
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