[support] Forms API question

Hi, I am busy taking over maintainership of automember.module from njivy, and making great progress, but I have a simple layout issue that bothers me. See attached screenshot. Is there a way to get the items inline instead of below each other as shown in the screenshot? I have defined no '<div>' tags by means of #prefix or #suffix, so that is not the reason for this problem. Please advice, Thanks! Kobus