This is the Editor Editor. It is for editing editor definition files.

Use the up and down arrow keys to navigate the list of widgets.

Press ESC to exit the editor editor.

Press F2 to save the editor definition file.

Press F3 to load an editor definition file.

Press Insert to create a new widget.

Press Delete to remove a widget.

Hold SHIFT and press the up and down arrow keys to reorder widgets.

Hold SHIFT and press the right arrow key to put a widget into a container. This only works if the widget right above the one you are selecting is a container-type widget.

Hold SHIFT and press the left arrow key to take a widget out of a container.

You can tell which widgets are in containers by how they are indented.

Press F5 to test the editor.