Select and Disable Features in Feature Tree Dialog in Installshield

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I have created an Installer using Installscript msi. I perform a custom installation installing only selective features. Now during the Maintenance Install, when I chose the Installation type to be "Custom', all features installed as part of fresh Installation (first time install) appear to be selected in the feature tree. I dont want the user to be able to deselect these features. Instead, I want these featured/sub features to appear as selected and grayed out. Basically user should not be able to remove any feature/subfeature selected during fresh install. How can I achieve this ?

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Windows Installer doesn't support this scenario. Maintenance install is meant to allow the user to remove or add features.