I was able to get the designer exception using the sample you've sent. But the exception raised is different this time -
" The control Sytem.Windows.Forms.TabControl has thrown an unhandled exception in the designer and has been disabled. Exception: Could not load type 'Microsoft.Practices.EnterpriseLibrary.Common.Configuration.EnterpriseLibraryContainer' from assembly
'Microsoft.Practices.EnterpriseLibrary.Common, Version=18.104.22.168, Culture=neutral, PublicKeyToken=31bf3856ad364e35'."
This is really weird since I don't know why it's still looking for the 4.1 version given that we're already using 5. Also, I was not able to confirm if this is something that only conflicts between the validator control and the reference entlib assemblies
(Validator control entlib version is 4.1 while referenced assembly is 5)
since when I tried this, this doesn't throw the said exception.
Anyway, removing and re-adding the validator again seems to remove the designer exception raised from my end. Could you check from your end if this will also work for you.
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