I have mine exactly just like you have them there and they don't work for me. The buttons tooltip works for it won't cast the spell.
<Page Name="Dirge">
<Data Name="Button1" Macro="useabilityonplayer Parent.Target Oration of Sacrifice" Tooltip="Oration"/>
<Data Name="Button2" Macro="useabilityonplayer Parent.Target Elegy at Death's Door" Tooltip="Elegy"/>
<Data Name="Button3" Macro="useabilityonplayer Parent.Target Hyran's Seething Sonata" Tooltip="Hyran's"/>
</Page>