I'm not sure why, but this seems to work for me:
<!--Next button-->
<Control Id="NextButton" Type="PushButton" ...>
<Condition Action="disable">
<![CDATA[DisableButton = "1"]]>
</Condition>
<Condition Action="enable">
<![CDATA[DisableButton <> "1"]]>
</Condition>
...
</Control>
<!--SelectionTree control-->
<Control
Id="MySelectionTree"
Type="SelectionTree"
...">
<Publish Property="DisableButton" Value="1" Order="1"><![CDATA[&FeatureA
<> 3]]></Publish>
<Publish Property="DisableButton" Value="0" Order="2"><![CDATA[&FeatureA
= 3]]></Publish>
</Control>
The conditions that check the action state is simpler in my example, but you
get the idea.
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