You can get access to those buttons in two three ways that I can think of...
1. From your text editor, make sure the whole expression is on a single line, copy it, and just paste it into the first field of the editor, and when you click on OK, MC will break it all down for you. Naturally, when you next open it, it will look like it does in your screencap.
2. Right click in the top left corner of the wizard, on the title bar itself, and you should get the menu shown as attached below. Click on "Move" and then use the cursor keys to move the wizard window up until you see the buttons.
3. The third is option is not so immediate result-wise, but I'm thinking there has to be a way to streamline what you are doing, as that seems like serious overkill to me. Is there no other common denominator for those files? If not, a regex based solution may be available to you, but I am not familiar enough with regex to have a go on your behalf, or to ask the right questions to be able to help you in that regard.