Hey Rick. Thanks for helping.
If I activate this panel by left-mouse-click (clicking on the tap) and try to start typing, nothing happens.
If I bring the panel to front with a keyboard-shortcut (in my case CMD+2) and try to start typing, nothing happens neither.
What I'm doing wrong?
Btw. I'm using Adobe After Effects CC 12.1 on a Mac with OS X 10.9.4
Again. Thanks for helping me with that.