"Not recognized" usually means Visual Studio doesn't know that the control exists. Double check your spelling to make sure you have the right name.
Where is the code that's trying to use the control? If it's in Form1, it should be able to see all of the controls in Form1. If it's in the other form, you would need to change the Modifiers property.
If you can't figure it out, you can zip up the project and email it to RodStephens@CSharpHelper.com
and I'll take a look.