Cannot log into System.Security.Cryptography.X509 Method Certificates

I am trying to debug the .net framework code for working with certificates. Sample code:

X509Store store = new X509Store(storeName, storeLocation);
store.Certificates.Find(findType, findValue, false);
and
(RSACryptoServiceProvider)signerCertificate.PrivateKey;

      

        
        
        
      

    

VS downloaded all available symbols from MS symbol servers. It takes a step into different .net framework code.

The debug modules show that only the available system module System.Security.ni.dll is available, and the status is "Cannot find or open PDB file."

Is it because of the .net framework version (4.5) or are there no crypto debug symbols available at all? Are they available elsewhere?