This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
Technically, you can't create a textfield in a canvas, but I think you can create a textfield overlay on a canvas. By which I mean that the 2 controls (textfield and canvas) occupy the same part of the screen (layout manager permitting), but the Z order of the textfield puts it in front of the canvas.
Just be careful when implementing the paint code so that the canvas does, in fact render behind the text control!
Customer surveys are for companies who didn't pay proper attention to begin with.