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Three-State CheckBox

<Window x:Class="SimpleStyles.Window1"   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   Title="SimpleStyles"   Background="#F8F8F8">   <ScrollViewer>     <WrapPanel>       <!-- CheckBox -->       <HeaderedItemsControl Header="CheckBox">         <CheckBox Margin="8">Normal</CheckBox>         <CheckBox Margin="8" IsChecked="true">Checked</CheckBox>         <CheckBox Margin="8" IsThreeState="true" IsChecked="{x:Null}">Indeterminate</CheckBox>       </HeaderedItemsControl>         </WrapPanel>   </ScrollViewer> </Window>