Hi Peter,
Thanks for using Syncfusion products.
With regards to your query "Need to interact with the ASP.NET control hosted inside the ControlNode" is an already known feature and the feature has been implemented. For this, please create a DT incident for your query so that we can update the patch for this feature.
You can create the DT incident from the following link.
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http://www.syncfusion.com/account/dashboard>
In the interests of maintaining confidentiality, we have a policy of not sharing patches or otherwise proprietary customer specific information in the public Forum.
Please let us know if you have any queries.
Regards,
Amsath Ali. M