rem: sliderImg = RRenderGradient(141, 16, &from, &to, RGRD_HORIZONTAL);
add: sliderImg = RRenderGradient(141, 16, &from, &(to.rgb), RGRD_HORIZONTAL);
context: hsbUpdateBrightnessGradient(W_ColorPanel *panel){    W_Screen	*scr = WMWidgetScreen(panel->win);    RColor	from;    RColor	to;    RHSVColor	hsvcolor;    RImage	*sliderImg;    WMPixmap	*sliderPxmp;        from.red = from.green = from.blue = 0;    hsvcolor = panel->hsvcolor;    hsvcolor.value = 255;        RHSVtoRGB(&hsvcolor, &to);        sliderImg = RRenderGradient(141, 16, &from, &to, RGRD_HORIZONTAL);    sliderPxmp = WMCreatePixmapFromRImage(scr, sliderImg, 0);    RDestroyImage(sliderImg);    W_PaintText(W_VIEW(panel->hsbBrightnessS), sliderPxmp->pixmap, 		panel->font12, 2, 0, 100, WALeft, WMColorGC(scr->white), False, 		"Brightness", strlen("Brightness"));    WMSetSliderImage(panel->hsbBrightnessS, sliderPxmp);    WMReleasePixmap(sliderPxmp);}