def modify_doc(doc):
p1 = Plot(height=400,
width=400,
x_range=Range1d(0, 1),
y_range=Range1d(0, 1),
min_border=10)
p2 = Plot(height=400,
width=400,
x_range=Range1d(0, 1),
y_range=Range1d(0, 1),
min_border=10)
layout = column(p1, button)
def cb(event):
if p2 not in layout.children:
layout.children = [p1, button, p2]
button.on_event('button_click', cb)
def iw(attr, old, new):
data['iw'] = (old, new)
def ih(attr, old, new):
data['ih'] = (old, new)
p2.on_change('inner_width', iw)
p2.on_change('inner_height', ih)
doc.add_root(layout)
