Control projects cannot be run alone.  Use File, Add Project to add a Standard Exe project, close the User Control design window, and then place a test instance of the control on Form1.

An ActiveX control cannot be run as an independent project. To test your control project:

• On the File menu, click Add Project to open the Add Project dialog box. Double-click the Standard EXE icon to add a standard executable project to the project group.
  
  
• On the File menu, click Save Project Group to save the project group. In future sessions, you can load both the control project and the test project by opening the project group.
  
  
• In the Project window, double-click your UserControl to bring its designer to the front. Press CTRL+F4 to close the design window and run the control.
  
  
• In the Toolbox, the control's icon is now enabled. Place a copy of the control on Form1 of the Standard EXE project.

Testing controls at design time and run time is introduced in the step-by-step procedures in "Creating an ActiveX Control" in the Component Tools Guide. More information on testing components can be found in "Debugging, Testing, and Deploying Components" and "Debugging Controls" in the Component Tools Guide.