Controls in VS2017

Hi, I have TFS 2013 and I can upgrade client Studios from 2013 to 2017. Web UI variants of WitCustomControls (at TFS server) stays still in version for TFS 2013. VS client variants must be upgraded to be compatible with VS 2017. One problem is error message: "Could not load file or assembly 'Microsoft.TeamFoundation.WorkItemTracking.Controls, Version=14.0.0.0, ..." when I install latest version of controls and rename folder to "15.0". I'm trying to change referenced assemblies to 15.0.0.0 version but cannot found them. Have anyone some tip? Second problem is underlying format and other compatibility aspects when Web UI using version for TFS2013 and client Studios using latest version.