[wix-users] Check a Checkbox control based on two other checkboxes

[Ven H]

I have a UI Dialog in which I have 3 checkboxes for installing features.
All, App and DB. I have 3 requirements
1. If All is checked, both App and DB have to be checked,
2. If App or DB is unchecked, All will be unchecked,
3. If both App and DB are checked, All will have to be checked.

I am able to achieve 1 and 2 above, but not able to achieve the 3rd case.
Can anyone please help? I have given the code below. Also, I am not able to
completely understand the meaning of Value={}

<Control Id="ControlAllFeature" Type="CheckBox" X="180" Y="33" Width="140"
Height="17"
    Property="ALLFEATURES_CHECKED" CheckBoxValue="AllFeatureValue"
Text="Install Everything">
          <Publish Property="APPFEATURE_CHECKED" Value="AppFeatureValue"
Order="1">ALLFEATURES_CHECKED</Publish>
          <Publish Property="APPFEATURE_CHECKED" Value="{}" Order="2">NOT
ALLFEATURES_CHECKED</Publish>
          <Publish Property="DBFEATURE_CHECKED" Value="DBFeatureValue"
Order="3">ALLFEATURES_CHECKED</Publish>
          <Publish Property="DBFEATURE_CHECKED" Value="{}" Order="4">NOT
ALLFEATURES_CHECKED</Publish>
          <Publish Property="ALLFEATURES_CHECKED"
Value="AllFeatureValue">APPFEATURE_CHECKED = 1 and DBFEATURE_CHECKED =
1</Publish>
        </Control>
        <Control Id="ControlAppFeature" Type="CheckBox" X="191" Y="50"
Width="140" Height="17"
     Property="APPFEATURE_CHECKED" CheckBoxValue="AppFeatureValue"
Text="Install Application">
          <Publish Property="ALLFEATURES_CHECKED" Value="{}" Order="1">NOT
APPFEATURE_CHECKED</Publish>
        </Control>
        <Control Id="ControlDBFeature" Type="CheckBox" X="191" Y="67"
Width="140" Height="17"
           Property="DBFEATURE_CHECKED" CheckBoxValue="DBFeatureValue"
Text="Install DB">
          <Publish Property="ALLFEATURES_CHECKED" Value="{}" Order="1">NOT
DBFEATURE_CHECKED</Publish>
        </Control>


Regards,
Venkatesh