How to register Custom HTML Element as widget in GWT

Did someone have any idea how to register custom html element as GWT widget uiBinder and use them directly in place of using in HTMLPanel. For eg if i'm using Google Polymer in my mgwt project i have to use this as <g:HTMLPanel > <paper-shadow class="{style.card}"> <mgwt:touch.TouchPanel ui:field="touchPanel"> <mgwt:panel.flex.FlexPanel orientation="VERTICAL" alignment="CENTER"> <g:Image url="{global.getDirection.getSafeUri.asString}" /> <g:HTMLPanel>Take me to Deal</g:HTMLPanel> </mgwt:panel.flex.FlexPanel> </mgwt:touch.TouchPanel> </paper-shadow> </g:HTMLPanel> I want to register/create paper-shadow as custom widget so that i can use this as <polymer:paper-shadow class="{style.card}"> <mgwt:touch.TouchPanel ui:field="touchPanel"> <mgwt:panel.flex.FlexPanel orientation="VERTICAL" alignment="CENTER"> <g:Image url="{global.getDirection.getSafeUri.asString}" /> <g:HTMLPanel>Take me to Deal</g:HTMLPanel> </mgwt:panel.flex.FlexPanel> </mgwt:touch.TouchPanel> <polymer:paper-shadow>

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