title: Visual Studio 2019 Doesn't seem to see that I have .NET Core 3.1 Installed (with SDK)
body: <p>I just installed Visual Studio a few days ago and for some reason I can't create anything but a class.</p>
  
  <p>When I go to create a new User Control the pop up window lets me do everything except for click the "Add" Button to close the window and create the control.</p>
  
  <p>If I double-click the User Control selector to create automatically, it pops up an alert box that says I need to go to the installer to get the .NET Framework target libraries. But when I go to the project's properties I see that I am already targeting .NET Core 3.1 and the only other option I have to target is .NET Core 3.0.... I assume this is because I'm in a .NET Core WPF application but I have no idea why it won't let me create a new control. It won't let me create anything except for a new class.</p>
  
  <p>What is going on here? How can I work around this bug?</p>