Describe the steps you are taking. That dialog box should only appear if you hit "Build" on a property that accepts code. That isn't creating a button, that is trying to look at what the wizard would produce; the code.
Thank you for your response. After thinking through you last comments. I tried it again. But this time ensure taht the Wand was active in as part of the toolbox icon. Previoulsy, I had activated the Wand button part of Form design. Many thanks. I am extremely grateteful as I have spent a day trying to figure where I was going wrong, or what I was not doing. Many thanks again.