'Parameters
pad : float, optional
Boundary pad.
sep : float, optional
Spacing between items.
width : float, optional
height : float, optional
width and height of the container box, calculated if
`None`.
align : str, optional
Alignment of boxes.
mode : str, optional
Packing mode.
Notes
*pad* and *sep* need to given in points and will be scale with
the renderer dpi, while *width* and *height* need to be in
pixels.'

def __init__(self, pad=None, sep=None, width=None, height=None, align=u'baseline', mode=u'fixed', children=None):

    super(VPacker, self).__init__(pad, sep, width, height, align, mode, children)
