Circular Slider Buttons
The circular slider has a set of buttons, one to the left and the other
to the right of the scroll range. These buttons are similar to the buttons
found on the linear slider. When selected, they modify the value of the
circular slider in opposing ways. If you decide you do not want to display
these buttons as part of your circular slider, specify the style CSS_NOBUTTON.
The bit maps that show a minus sign (-) on the left button and a plus sign
(+) on the right button can be replaced. For example, you might want to
use a left arrow () and a right arrow (). To set the bit map data for
the replacement bit maps, the owner window must send the CSM_SETBITMAPDATA
control message. The optimal size for the button bit maps is 10x10 pels.
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