Just change the format with the Format drop down box. Nothing is stopping you from switching modes in CkEditor.
The problem with this is that when I have an ID in one section and text to edit in the other, switching to WYSIWYG for the whole thing screws up the ID, and I have to start over. There's no ability to go back and forth.
You just can't do it with the Source button, because that makes it too easy to mess up your code without warning.
I've never messed up my code using the Source button. When it's happened, it's always been with the Format drop-down. When the Source button's been involved, it's because I had the page in WYSIWYG with the Source button on in the section in question, and of course the Source button isn't sticky so it switched directly to WYSIWYG. It's for this reason that I'm careful to never edit a page with an ID without opening the source code first.
The problem with this is that when I have an ID in one section and text to edit in the other, switching to WYSIWYG for the whole thing screws up the ID, and I have to start over. There's no ability to go back and forth.
I've never messed up my code using the Source button. When it's happened, it's always been with the Format drop-down. When the Source button's been involved, it's because I had the page in WYSIWYG with the Source button on in the section in question, and of course the Source button isn't sticky so it switched directly to WYSIWYG. It's for this reason that I'm careful to never edit a page with an ID without opening the source code first.