diff --git a/.todo b/.todo
index 34f09ef..e53b7f5 100644
--- a/.todo
+++ b/.todo
@@ -1,2 +1,2 @@
-add 3d-picking routines using temporary ODE ray geometries
+add API documentation for ag.pickObjects()
 add audio capabilities
diff --git a/ag.cc b/ag.cc
index 39013fc..a6a57ba 100644
--- a/ag.cc
+++ b/ag.cc
@@ -100,8 +100,8 @@ namespace ag
                 lua_getfield(L, -1, "_objects");            /* pushes 1 */
                 lua_pushinteger(L, *it);                    /* pushes 1 */
                 lua_gettable(L, -2);                        /* replace top */
+                lua_remove(L, -3);                          /* remove 1 */
                 lua_remove(L, -2);                          /* remove 1 */
-                lua_remove(L, -1);                          /* remove 1 */
                 if (!lua_isnil(L, -1))
                 {
                     lua_pushinteger(L, next_index++);       /* push key */
@@ -300,7 +300,7 @@ namespace ag
         lua_getfield(L, LUA_GLOBALSINDEX, "ag");        /* pushes 1 */
         lua_getfield(L, -1, "_objects");                /* pushes 1 */
         lua_pushinteger(L, id);                         /* pushes 1 */
-        lua_pushvalue(L, 1);                            /* pushes 1 */
+        lua_pushvalue(L, -4);                           /* pushes 1 */
         lua_settable(L, -3);                            /* pops 2 */
         lua_pop(L, 2);                                  /* pops 2 */
     }
diff --git a/tests/managed_objects.lua b/tests/managed_objects.lua
index 7450479..cee29d8 100644
--- a/tests/managed_objects.lua
+++ b/tests/managed_objects.lua
@@ -60,6 +60,11 @@ end
 
 function mousebutton_down_event(button, x, y)
     if (button == 1) then
-        ag.pickObjects(x, y)
+        objects = ag.pickObjects(x, y)
+        if (objects ~= nil) then
+            for id, obj in ipairs(objects) do
+                obj:setColor(0, 0, 1)
+            end
+        end
     end
 end