How to dismiss the spelling dialogue without using the mouse

Question

I'd appreciate the right tip from anyone on how to dismiss the spelling dialogue in Mail without using the mouse. (I'm one of those guys who likes to use the keyboard as much as possible.) Here's the scenario:
I open a new message in Mail, type my text, press Cmd-Shift-D, then (because I have it set to check spelling when I "click send") up pops the spelling dialogue. That's fine as far as it goes, but many times I don't need any corrections because either I don't care or because the words are fine but just not recognized by Mail. So until now what I do is use the mouse to click on the far left one of the three round buttons in the upper left corner of the dialogue. I would like not to have to use the mouse, but pressing Esc or any other keys I try doesn't work to make it go away.
Your advice is welcome! Thanks.

Answer 1

Well, that window is actually a floating window, which means that it is meant to hang around. Notice that if you move Mail to the background (without hiding it), the spelling window hides itself, then shows itself again when you bring Mail back to the front. Floating windows are kind of in their own little world, meant to float above windows while not interfering with keystrokes sent to the frontmost window.
I would argue that it shouldn't be a floater, because nobody's going to want it around once they're done checking spelling. But that's kind of a matter of opinion, and obviously Mail's designers thought differently.
BTW, in the course of writing this, I discovered something -- if you click in the spelling window, so that you could type in the field there, Command-W will actually close the floater. But, of course, that still requires a click in the window with the mouse.