Class for gaction
add_keybinding(key)
Add keybinding to document for this action. Key is value for Ext.EventObject: http://docs.sencha.com/ext-js/4-1/#!/api/Ext.EventObject. Use Ctrl-X, Alt-X of Shift-X indicate keys
connect_to_toolkit_signal(signal, ...)
Connect signal of toolkit to notify observer
get_value(...)
Get main property, Can't query widget, so we store here
set_value(value, ...)
Set main property, invoke change handler on change
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