Your Image1 image is behind your buttonBkg1 image. You need to reveres the zorder of your nodes.
Like so;
Code:
<Image AbsorbsInput="false" Location="4,3" Name="Image1" ScrollExtent="15,15" Size="15,15" SourceRect="130,40,170,80" SourceResource="/images/icons/icon_is6.dds" /></image>
<Image AbsorbsInput="false" Location="0,0" Name="buttonBkg1" ScrollExtent="22,21" Size="22,21" Stretch="false" Style="buttonBkg"/></Image>