How to replace over cast sky (no pixels) using Photoshop 8?

New to Photoshop 8 for Mac OSX. Image has a severely over cast sky. Essentially no pixels. Attempted to use smart brush or quick fix using info shown on Adobe TV. The blank sky area was selected properly but the color ( blue sky 1) failed to be added. These tools seem to work only when there are some pixels (color ) in the selected area. I did successfully use the quick fix feature on an image that had some pixels within the selected sky area. Having the capability to easily add blue sky to a severely overcast sky will be necessary to upgrade fron PSE6 to PSE6.

I am not an expert re this tool, having had occasion to use it just a couple of times.
Be sure that in the tool's option bar, "inverse" is not checked if you want to work on the subject
I did an experiment, opening up a new blank file, transparent. I could not lay down any color with the tool.
The same obtains when you go to Enhance>adjust color>replace color. If the layer is all black or white (i.e.no color), then it will not work.
My take on this is that some pixels have to be present for functionality.

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