Visual Studio wont allow copy & paste from one project to another

I have updated to version 17.3.1 of Visual Studio a few weeks ago and just tried to create a windows forms project which is very similar to an existing windows forms project. I wanted to copy the controls from the existing project into the new project but found that when I copy the control (using copy or Ctrl-C) and move to the new project and attempt to paste the paste option is "greyed" out or disabled. Has something changed where I need to enable pasting. Your help is appreciated. Brad