Gallery Items in Ribbon

You can include the following code to implement the Gallery in your Ribbon.

<customUI xmlns="http://schemas.microsoft.com/office/2006/01/customui" loadImage="LoadImage" >
   <ribbon startFromScratch="false">
      <tabs>
         <tab id="tab1" label="Gallery Demo" keytip="x" >
            <group id="group1" label="Demo Group">
               <gallery id="gallery1" 
                  columns="2" 
                  rows="2" 
                  getEnabled="GetEnabled" 
                  getScreentip="GetScreenTip" 
                  supertip="This is the super tip." 
                  getKeytip="GetKeyTip" 
                  getShowImage="GetShowImage" 
                  getShowLabel="GetShowLabel"
                  getLabel="GetLabel" 
                  getSize="GetSize" 
                  image="internetconnection.bmp" 
                  getItemCount="GetItemCount" 
                  getItemHeight="GetItemHeight" 
                  getItemWidth="GetItemWidth" 
                  getItemImage="GetItemImage" 
                  getItemLabel="GetItemLabel" 
                  getItemScreentip="GetItemScreenTip" 
                  getItemSupertip="GetItemSuperTip"  
                  onAction="galleryOnAction" >
                     <item id="item1" />
                     <item id="item2" />
                     <item id="item3" />
                     <item id="item4" />
                     <button id="button1" getLabel="GetLabel" 
                        onAction="buttonOnAction" 
                        imageMso="HappyFace" />
               </gallery>
            </group>
         </tab>
      </tabs>
   </ribbon>
</customUI>

URL:

http://msdn.microsoft.com/en-us/library/bb736142.aspx