Three-State CheckBox

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<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>