Undefined Error in moon.Checkbox.

Issue:
If we create ''moon.FormCheckBox" in the group control. the dynamic
operations like create and destroy is causing exception.
Fix:
performing a check in 'decorateActivateEvent' for the current
'moon.Checkbox' component.

Enyo-DCO-1.1-Signed-off-by: Srinivas V srinivas.v@lge.com