Flash Catalyst public beta, doesn’t allow you to edit code while in ‘CODE’ view. I was running into issues trying to remove ‘tracking’ from text property that TLF doesn’t support.

Workaround: you can just right click the file you want to edit and select ‘Open With’ and then select ‘Text Editor’. Once you made your changed right click the document and select ‘Save’ from the right click context menu. Once you saved the file the changes will be committed.

Thanks @boobiestar for finding the workaround.