MSG_ZOOM_IN
case MSG_ZOOM_IN:
fToolBar->AddAction(MSG_ZOOM_IN, this, tool_bar_icon(kIconZoomIn),
_AddItemMenu(menu, B_TRANSLATE("Zoom in"), MSG_ZOOM_IN, '+', 0, this);
fZoomIn = new BButton(bounds, "zoomIn", "Zoom in", new BMessage(MSG_ZOOM_IN));
case MSG_ZOOM_IN:
fZoomIn = new BButton(BRect(left, top, left+10, top+10), "ZoomIn", "Zoom In", new BMessage(MSG_ZOOM_IN));
case MSG_ZOOM_IN: fPreview->ZoomIn();