I am used to creating Add-Ins with my own custom functions, but what I want to do now is create an Add-In with a user interface. If I create a form, how can I make it show? For the Add-Ins that come with Microsoft Office Excel, the user interfaces are opened by selecting "Tools" from the toolbar, and then the name of the Add-In. How can I do the same with my own Add-In? Any help is much appreciated