Determines where the image and text appear on a speed button.
Set Spacing to the number of pixels that should appear between the image specified in the Glyph property and the text specified in the Caption property.
If Spacing is a positive number, its value is the number of pixels between the image and text. If Spacing is 0, the image and text appear flush with each other. If Spacing is -1, the text appears centered between the image and the button edge.