Is USD Custom Control supported in USD 4.1

Hi All,

For a client, we implemented a custom Hosted Control for USD 3.2.

Recently, we are investigating on the possibility to move to V4.1. So we created a test instance in which, we upgraded USD server side v4.1. In order to have USD works properly, we also upgraded the client side application.

Since upgrade, we encounter an issue with our customer Hosted Control. 

• Could not load file or assembly 'Microsoft.Xrm.Tooling.WebResourceUtility, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'

So I added the assembly into the zip 'Customization File'.

Then we encounter anther issue : Missing field exception

• 'Microsoft.Crm.UnifiedServiceDesk.Dynamics.DynamicsBaseHostedControl._crmWebResource'

We repeated the test using a Client USD 4.1 and Server 3.2. The issue is still present. 

However with a Client USD 4.0 and Server 3.2. The Custome Hosted Control works perfectly.

Also we had a look on Microsoft documentation. We did not find any reference of the assmeblies Microsoft.Xrm.Tooling.WebResourceUtility and Microsoft.Crm.UnifiedServiceDesk.Dynamics.

Is there any chance that Custom Hosted Controls are not supported anymore in USD 4.1

Thanks for your help !

Anthony