Product Required Attribute values on eConfigurater Behaviour

I have a client requirement like Configurater should not close, if there is any required attributes.

Vanilla behaviour is, if there is any required attributes are available and user didn't select the attribute vales and click on Done button, conflict message will generate, if we click on OK and Done button configurater will close, but as per client requirement configurator should not closed. We have explored and created a customer custom function is used CfgDoneConfig in eCfgTopLevelButtonsJS.swt file. Its working fine as expected find below peace of code

<!-- Template Start: eCfgTopLevelButtonsJS.swt -->

<script>

     var sCustomizeLabel = CfgGetLocalString ("IDS_CXP_UI_CUSTOMIZE");