The title says it all. Or I'm a total noob and missed how to delete TextLine objects, which is also entirely possible.

Ctrl+ click it, then edit menu delete object

Wow ok, I didn't expect that.
Thanks.

No problem, noticed it myself that ctrl delete didnt work.

you can also ctrl, click the textLine, click alt wait for the menu to drop down, then hold ctrl and press delete

While we're in the GUI editor. I was wondering how to manage more complex objects such as the tabs in the options window of RPG2. The regions are overlapping there. What options do I have to edit them? I'm really missing a list of all the GUI objects where you can select/deselect, hide/unhide and these basic tasks.
Am I right that the only way to do this would be to put them next to each other and then move them onto each other when done?

When creating it yes moving them to the side is the easiest, you can also change the level with ctrl+pageup and ctrl+pagedown, just keep using page down when you want a gui part below the other again.