I came across an answer. Try the following:
<BulletDecorator
Margin="0,5,0,0">
<BulletDecorator.Bullet>
<CheckBox />
</BulletDecorator.Bullet>
<TextBlock
Width="100"
TextWrapping="Wrap"
HorizontalAlignment="Left"
Foreground="Blue"
Margin="5,0,0,0">
Some text
</TextBlock>
</BulletDecorator>
with, of course, changes to suit your needs.
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