Check checkbox when another checkbox is checked - checkbox

Question

Here is my WIX:
<Control Id="FeatureOneBox" Type="CheckBox" Property="FEATUREONE" Text="Feature One" X="30" Y="87" Height="10" Width="200" CheckBoxValue="1" />
<Control Id="FeatureTwoBox" Type="CheckBox" Property="FEATURETWO" Text="Feature Two" X="30" Y="107" Height="10" Width="200" CheckBoxValue="1" />
<Control Id="FeatureThreeBox" Type="CheckBox" Property="FEATURETHREE" Text="Feature Three" X="30" Y="107" Height="10" Width="200" CheckBoxValue="1" />
<Control Id="CoreFeatureBox" Type="CheckBox" Property="INSTALLCORE" Text="!(loc.CoreFeatureBox)" X="30" Y="147" Height="10" Width="300" CheckBoxValue="1">
<Condition Action="enable"><![CDATA[FEATURETWO <> 1 AND FEATURETHREE <> 1]]></Condition>
<Condition Action="disable">FEATURETWO = 1 OR FEATURETHREE = 1</Condition>
</Control>
I want to require the Core feature if either feature two or three is selected. I can do this by altering the feature condition but, it the user unchecks both of those, unchecks Core, then rechecks one of those, I don't want to install the Core feature even though its checkbox is unchecked.
How can I check CoreFeatureBox at the same time I disable it?

Answer 1

If only I'd googled just a few minutes more!
This code is all I needed:
<Control
Id="CB1"
Type="CheckBox"
Property="myCheckboxResult"
CheckBoxValue="my value"
Text="Check the box please."
X="50"
Y="50"
Height="10"
Width="150">
<Publish Property="myCheckboxResult2" Value="my value" Order="1">myCheckboxResult</Publish>
<Publish Property="myCheckboxResult2" Value="{}" Order="2">NOT myCheckboxResult</Publish>
</Control>
<Control
Property="myCheckboxResult2"
Id="CB2"
Type="CheckBox"
CheckBoxValue="my value"
Text="Check the box please."
X="50"
Y="70"
Height="10"
Width="150" />
I added the <Publish/> nodes under FeatureTwoBox and FeatureThreeBox and everything's working.