在Silverlight中修改新Popup控件(ChildWindow)的外观/行为

                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:local="clr-namespace:YourNamespace">

   <Style x:Key="CustomChildWindowStyle" TargetType="ChildWindow">
        <!-- 在这里添加自定义样式和模板 -->
    </Style>
</ResourceDictionary>

   <ResourceDictionary>
       <ResourceDictionary.MergedDictionaries>
           <ResourceDictionary Source="ChildWindowStyles.xaml"/>
        </ResourceDictionary.MergedDictionaries>
        <!-- 其他资源 -->
    </ResourceDictionary>
</Application.Resources>

   <Setter Property="OverlayStyle" Value="{StaticResource CustomOverlayStyle}"/>
   <Setter Property="OverlayOpacity" Value="0.7"/>
   <Setter Property="BorderThickness" Value="2"/>
   <Setter Property="BorderBrush" Value="Red"/>
   <Setter Property="Background" Value="White"/>
   <Setter Property="Template">
       <Setter.Value>
           <ControlTemplate TargetType="ChildWindow">
                <!-- 在这里添加自定义控件模板 -->
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             Style="{StaticResource CustomChildWindowStyle}">
    <!-- 在这里添加其他控件和内容 -->
</ChildWindow>