ribbon.xml

<customUI xmlns="http://schemas.microsoft.com/office/2006/01/customui" onLoad="OnAddinLoad">
    <ribbon startFromScratch="false">
        <tabs>
            <tab id="zoteroTab" label="Zotero" keytip="C">
                <group id="zoteroGroup" label="Zotero">
                    <button id="btnAddEditCitation" label="Add/Edit Citation" onAction="OnAction" getImage="GetImage" visible="true" size="large" supertip="Insert a new citation, or edit the citation at the current cursor position" keytip="C"/>
                    <button id="btnAddEditBib" label="Add/Edit Refs" onAction="OnAction" getImage="GetImage" visible="true" size="large" supertip="Insert a new bibliography, or edit the existing bibliography, at the current cursor position" keytip="B"/>
                    <button id="btnRefresh" label="Refresh" onAction="OnAction" getImage="GetImage" visible="true" size="large" supertip="Update all citations to reflect changes" keytip="R"/>
                    <button id="btnPref" label="Preferences" onAction="OnAction" getImage="GetImage" visible="true" supertip="Change the citation style or locale" keytip="P"/>
                    <button id="btnAddNote" label="Add Note" onAction="OnAction" getImage="GetImage" visible="true" supertip="Insert a new note at the current cursor position" keytip="N"/>
                    <button id="btnUnlink" label="Unlink" onAction="OnAction" getImage="GetImage" visible="true" supertip="Remove all Zotero field codes and unlink from Zotero library" keytip="U"/>
                    <button id="btnExport" label="Export" onAction="OnAction" getImage="GetImage" visible="true" supertip="Export the document to switch to another word processor" keytip="E"/>
                    <button id="btnAbout" label="About" onAction="OnAction" getImage="GetImage" visible="true" size="large" supertip="About this add-on" keytip="A"/>
                </group>
            </tab>
        </tabs>
    </ribbon>
</customUI>