void ui_draw_but_NORMAL(uiBut *but, struct uiWidgetColors *wcol, rcti *rect);
void ui_draw_but_CURVE(ARegion *ar, uiBut *but, struct uiWidgetColors *wcol, rcti *rect);
void ui_draw_but_IMAGE(ARegion *ar, uiBut *but, struct uiWidgetColors *wcol, rcti *rect);
+void ui_draw_but_TRACKPREVIEW(ARegion *ar, uiBut *but, struct uiWidgetColors *wcol, rcti *rect);
/* interface_handlers.c */
extern void ui_button_activate_do(struct bContext *C, struct ARegion *ar, uiBut *but);