The PaintBucket tool used to fill areas of the same color with a different color. Select the text color that you want to fill with from the picker, then click once on the area that is to be filled.
	Note: Filling does not work on a dithered area. If you have a need for this, set the actual depth of your document to 8-bit gray or 24-bit color. The paintbucket will now work on dithered areas (because the actual data is not dithered).