FullTrust and Digitally Signed XBAP viewer still shows the Security Warning Popup?

I have published a XBAP application via Click Once full trust settings and digitally signed the same. I am publishing this XBAP on .NetFramework 4. But still it shows the Application - Security Warning popup for a first time before it get installed in the local machine. I am calling this XBAP Application from a word ribbon control. How can i bypass this security-application warning popup.

Please note : I am getting security-application warning popup message with publisher details since i have digitally signed. But i want to skip this popup. Any thoughts? Kindly help me.

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