| pDC | A pointer to a device context. |
| pSlider | A pointer to a slider. |
| rect | Bounding rectangle. |
| bIsHighlighted | TRUE if the thumb is highlighted. |
| bIsPressed | TRUE if the thumb is pressed. |
| bIsDisabled | TRUE if the thumb is disabled. |
| bVert | Specifies whether the slider is vertical (TRUE), or horizontal (FALSE). |
| bLeftTop | Specifies the thumb orientation. If TRUE, the thumb's arrow points to the left or up (depending on bVert). If FALSE, the thumb's arrow points to the right or bottom. |
| bRightBottom | Specifies the thumb orientation. If TRUE, the thumb's arrow points to the right or bottom (depending on bVert). If FALSE, the thumb's arrow points to the left or top. |
| bDrawOnGlass | If TRUE, the thumb is drawn on the glass (Vista Aero only). |