rem: updateColorPreviewBox(panel, 1<<p);
add: updatePreviewBox(panel, 1<<p);
context: colorWellObserver(void *self, WMNotification *n){    _Panel *panel = (_Panel*)self;    int p;    p = WMGetPopUpButtonSelectedItem(panel->colP);    WMReleaseColor(panel->colors[p]);    panel->colors[p] = WMRetainColor(WMGetColorWellColor(panel->colW));    updateColorPreviewBox(panel, 1<<p);}