如何在自定义WPF UserControl中正确使用ContentPresenter

<UserControl x:Class="YourNamespace.YourUserControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Grid>
        <!-- 其他控件 -->
        <ContentPresenter />
    </Grid>
</UserControl>

<Window x:Class="YourNamespace.YourWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:YourNamespace">
    <Grid>
        <local:YourUserControl>
            <!-- 嵌入的内容 -->
            <Button Content="Click me!" />
        </local:YourUserControl>
    </Grid>
</Window>