ButtonWithMeta.py

class MetaButton(object):
    CMD = cmds.button
    __metaclass__ = ControlMeta
    
    def __init__(self, *args, **kwargs):
        self.Widget = self.CMD (*args, **kwargs)
        
        
w = cmds.window()
c = cmds.columnLayout()
mb = MetaButton("button1")
cmds.showWindow(w)

print mb.exists  # We never had to add this one!
# True
print mb.visible  # or this
# True