CheckBoxBaseStyle
The default style of the checkbox is not recommended for direct use and should always be used by other styles in the BasedOn mode.
NOTE
Example:
<StackPanel>
<CheckBox Content="CheckBox" IsChecked="True"/>
<CheckBox Margin="0,16,0,0" Content="CheckBox" IsChecked="True" IsEnabled="False"/>
<CheckBox Margin="0,16,0,0" Content="CheckBox"/>
<CheckBox Margin="0,16,0,0" Content="CheckBox" IsEnabled="False"/>
<CheckBox Margin="0,16,0,0" Content="CheckBox" IsChecked="{x:Null}"/>
<CheckBox Margin="0,16,0,0" Content="CheckBox" IsChecked="{x:Null}" IsEnabled="False"/>
</StackPanel>