POPUP in Alfrescp

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POPUP in Alfrescp

I have to display a message when clicking "Reject" button as the picture below:

I have consulted some tutorials:


And I configure action config in "...\tomcat\shared\classes\alfresco\web-extension\share-config-custom.xml" 

But it looks like I did something wrong or missing.

Please guide me to show popup. (I using Alfresco 5.2)
Thank you in advance.