diff --git a/public/build.json b/public/build.json
index 52a1cdf129..e3e5d2bb55 100644
--- a/public/build.json
+++ b/public/build.json
@@ -42,6 +42,7 @@
 			"lib/public/css/ui/list.css",
 			"lib/public/css/ui/views.css",
 			"lib/public/css/ui/fonts.css",
+			"lib/public/css/views/tree_grid.css",
 		]
 	},
 
diff --git a/public/css/views/tree_grid.css b/public/css/views/tree_grid.css
new file mode 100644
index 0000000000..c91e17584b
--- /dev/null
+++ b/public/css/views/tree_grid.css
@@ -0,0 +1,21 @@
+.cell-title {
+	font-weight: bold;
+}
+
+.cell-effort-driven {
+	text-align: center;
+}
+
+.toggle {
+	height: 9px;
+	width: 9px;
+	display: inline-block;
+}
+
+.toggle.expand {
+	background: url("../lib/images/icons/expand.gif") no-repeat center center;
+}
+
+.toggle.collapse {
+	background: url("../lib/images/icons/collapse.gif") no-repeat center center;
+}
\ No newline at end of file
diff --git a/public/images/icons/collapse.gif b/public/images/icons/collapse.gif
new file mode 100644
index 0000000000..01e691450c
Binary files /dev/null and b/public/images/icons/collapse.gif differ
diff --git a/public/images/icons/expand.gif b/public/images/icons/expand.gif
new file mode 100644
index 0000000000..1b24ef1248
Binary files /dev/null and b/public/images/icons/expand.gif differ