undo option in Dialog Editor

[ckaware]

Hi, I have added a next button in the progress bar, I gave the option false in the dialog.
Now that I want the button to be completely removed. But once I made it false, I am not able to click on it..
How Can I remove it?
I have attached the snapshot

This is a problem with the editor, if you "Disable" a button for example, you cannot select it without MOVING the panel/ image or object on top of it.

[FrancescoT]

Have tried using the TAB key to navigate within dialog controls