Add css info for attachment tree

mailnews/compose/resources/skin/messengercompose.css

@@ -15,3 +15,15 @@ box.padded {
     margin: 10px;
     width: 100%;
 }
+
+tree[class="attachment"] treeitem > treerow > treecell > titledbutton {
+ vertical-align: bottom;
+ min-height: 1px;
+ min-width: 1px;
+ height: 1em;
+ width: 1em;
+ margin:0px;
+ padding:0px;
+ border:2px groove black;
+ list-style-image: url("chrome://addressbook/skin/myaddrbk.gif");
+}