Cycles Node Editor:

* Add Use Nodes button for World shader type
* UI was not redrawing the Node area, when enabling "Use nodes", added check for it to the listener.

intern/cycles/blender/addon/ui.py

@@ -241,7 +241,7 @@ class CyclesCamera_PT_dof(CyclesButtonsPanel, Panel):
 
 
 class Cycles_PT_context_material(CyclesButtonsPanel, Panel):
-    bl_label = "Surface"
+    bl_label = ""
     bl_context = "material"
     bl_options = {'HIDE_HEADER'}
 

release/scripts/startup/bl_ui/space_node.py

@@ -61,6 +61,7 @@ class NODE_HT_header(Header):
                     
             if snode.shader_type == 'WORLD':
                 layout.template_ID(scene, "world", new="world.new")
+                layout.prop(snode_id, "use_nodes")
 
         elif snode.tree_type == 'TEXTURE':
             layout.prop(snode, "texture_type", text="", expand=True)

source/blender/editors/space_node/space_node.c

@@ -214,6 +214,11 @@ static void node_area_listener(ScrArea *sa, wmNotifier *wmn)
 					ED_area_tag_refresh(sa);
 			}
 			break;
+		case NC_WORLD:
+			if(type==NTREE_SHADER) {
+				ED_area_tag_refresh(sa);	
+			}
+			break;
 		case NC_OBJECT:
 			if(type==NTREE_SHADER) {
 				if(wmn->data==ND_OB_SHADING)