hi all. i built a gallery on a xml ribbon. in xml file, the gallery has structu

gallery id="glrSymbolic"
getItemLabel="glrSymbolic_getItemLabel"

item id="id1" label="%LastName%" /
item id="id2" label="%FirstName%" /
item id="d3" label="%UserName%" /
item id="id4" label="%Email%" /
/gallery


in the cs file. i callback event getItemLabel

public string glrSymbolic_getItemLabel(Office.IRibbonControl control, string index)
{
switch (index)
{
case "id1":
return "%LastName%";
case "id2":
return "%FirstName%";
case "id3":
return "%UserName%";
case "id4":
return "%Email%";
default:
return String.Empty;
}
}

my purpose is that i want to get the label of items in the gallery whenever i choice a item from gallery but it's not work. can you give me some suggestions?