My issue is as follows. If you set a custom script to be run when you click a picker button, the code gets executed once when the Anim Picker window is first shown.
So if for example I set this custom script:
‘’’
import maya.cmds as cmds
cmds.sphere()
‘’’
when I first open the Anim Picker GUI a sphere is created. This means that i f I have 7 buttons with the above code, 7 spheres are created. I don’t know if this is something just happening to me or what.
Cheers
There is an __INIT__ global var to know when is the anim_picker initialized. 
it is needed to change the button text and update data the first time is load.
For example here:
Note also the var __SELF__
Nice, is this documented? just to know where I can find more info. Already working as expected introducing
if not __INIT__:
at the start of the code block
Thanks Miquel for the quick response. Keep it up!
Dadle duro y gracias de nuevo.
Carlos Rico Adega
I am working on a tool to create Pickers from degree 1 curves,so we can use Maya tools to draw our widgets. I attach a screenshot. For now you can set the widget color, text, text size, text color, associated controls and associated script. I think via curves we can design more intricate pickers. Cheers.
Sorry, I think is not documented. At less yet 
Your curve to widget idea looks really cool!!! 
