int width = Math.max (0, (lParam & 0xFFFF) - spacing * 2);
RECT rect = new RECT (); OS.GetClientRect (handle, rect); int width = Math.max (0, (rect.right - rect.left) - spacing * 2);
LRESULT WM_SIZE (int wParam, int lParam) {	LRESULT result = super.WM_SIZE (wParam, lParam);	int width = Math.max (0, (lParam & 0xFFFF) - spacing * 2);	for (int i = 0; i < itemCount; i++) {		ExpandItem item = items[i];		if (item.width != width) item.setBounds (0, 0, width, item.height, false, true);	}	setScrollbar ();	return result;}