/// <summary>
        /// Recreates all the GUI elements used by this inspector.
        /// </summary>
        private void BuildGUI()
        {
            Layout.Clear();

            Animation animation = InspectedObject as Animation;

            if (animation == null)
            {
                return;
            }

            animationClipField.OnChanged += x =>
            {
                AnimationClip clip = Resources.Load <AnimationClip>(x.UUID);

                animation.DefaultClip = clip;
                MarkAsModified();
                ConfirmModify();
            };

            wrapModeField.OnSelectionChanged += x =>
            {
                animation.WrapMode = (AnimWrapMode)x;
                MarkAsModified();
                ConfirmModify();
            };

            speedField.OnChanged   += x => { animation.Speed = x; MarkAsModified(); };
            speedField.OnConfirmed += ConfirmModify;
            speedField.OnFocusLost += ConfirmModify;

            cullingField.OnChanged        += x => { animation.Cull = x; MarkAsModified(); ConfirmModify(); };
            overrideBoundsField.OnChanged += x => { animation.UseBounds = x; MarkAsModified(); ConfirmModify(); };
            centerField.OnValueChanged    += x =>
            {
                AABox   bounds = animation.Bounds;
                Vector3 min    = x - bounds.Size * 0.5f;
                Vector3 max    = x + bounds.Size * 0.5f;

                animation.Bounds = new AABox(min, max);
                MarkAsModified();
            };
            centerField.OnConfirm   += x => ConfirmModify();
            centerField.OnFocusLost += ConfirmModify;

            sizeField.OnValueChanged += x =>
            {
                AABox   bounds = animation.Bounds;
                Vector3 min    = bounds.Center - x * 0.5f;
                Vector3 max    = bounds.Center + x * 0.5f;

                animation.Bounds = new AABox(min, max);
                MarkAsModified();
            };
            sizeField.OnConfirm   += x => ConfirmModify();
            sizeField.OnFocusLost += ConfirmModify;

            Layout.AddElement(animationClipField);
            Layout.AddElement(wrapModeField);
            Layout.AddElement(speedField);
            Layout.AddElement(cullingField);
            Layout.AddElement(overrideBoundsField);

            GUILayoutX boundsLayout = Layout.AddLayoutX();

            boundsLayout.AddElement(new GUILabel(new LocEdString("Bounds"), GUIOption.FixedWidth(100)));

            GUILayoutY boundsContent = boundsLayout.AddLayoutY();

            boundsContent.AddElement(centerField);
            boundsContent.AddElement(sizeField);

            // Morph shapes
            Renderable  renderable  = animation.SceneObject.GetComponent <Renderable>();
            MorphShapes morphShapes = renderable?.Mesh.Value?.MorphShapes;

            if (morphShapes != null)
            {
                GUIToggle morphShapesToggle = new GUIToggle(new LocEdString("Morph shapes"), EditorStyles.Foldout);

                Layout.AddElement(morphShapesToggle);
                GUILayoutY channelsLayout = Layout.AddLayoutY();

                morphShapesToggle.OnToggled += x =>
                {
                    channelsLayout.Active = x;
                    Persistent.SetBool("Channels_Expanded", x);
                };

                channelsLayout.Active = Persistent.GetBool("Channels_Expanded");

                MorphChannel[] channels = morphShapes.Channels;
                for (int i = 0; i < channels.Length; i++)
                {
                    GUILayoutY channelLayout = channelsLayout.AddLayoutY();

                    GUILayoutX channelTitleLayout = channelLayout.AddLayoutX();
                    channelLayout.AddSpace(5);
                    GUILayoutY channelContentLayout = channelLayout.AddLayoutY();

                    string    channelName      = channels[i].Name;
                    GUIToggle channelNameField = new GUIToggle(channelName, EditorStyles.Expand, GUIOption.FlexibleWidth());

                    channelTitleLayout.AddSpace(15); // Indent
                    channelTitleLayout.AddElement(channelNameField);
                    channelTitleLayout.AddFlexibleSpace();

                    channelNameField.OnToggled += x =>
                    {
                        channelContentLayout.Active = x;

                        Persistent.SetBool(channelName + "_Expanded", x);
                    };

                    channelContentLayout.Active = Persistent.GetBool(channelName + "_Expanded");

                    MorphShape[] shapes = channels[i].Shapes;
                    for (int j = 0; j < shapes.Length; j++)
                    {
                        GUILayoutX shapeLayout = channelContentLayout.AddLayoutX();
                        channelContentLayout.AddSpace(5);

                        LocString nameString = new LocString("[{0}]. {1}");
                        nameString.SetParameter(0, j.ToString());
                        nameString.SetParameter(1, shapes[j].Name);
                        GUILabel shapeNameField = new GUILabel(shapes[j].Name);

                        LocString weightString = new LocEdString("Weight: {0}");
                        weightString.SetParameter(0, shapes[j].Weight.ToString());
                        GUILabel weightField = new GUILabel(weightString);

                        shapeLayout.AddSpace(30); // Indent
                        shapeLayout.AddElement(shapeNameField);
                        shapeLayout.AddFlexibleSpace();
                        shapeLayout.AddElement(weightField);
                    }
                }
            }
        }
        /// <inheritdoc/>
        protected internal override void Initialize()
        {
            Animation animation = (Animation)InspectedObject;

            drawer.AddDefault(animation);

            // Morph shapes
            Renderable  renderable  = animation.SceneObject.GetComponent <Renderable>();
            MorphShapes morphShapes = renderable?.Mesh.Value?.MorphShapes;

            if (morphShapes != null)
            {
                GUIToggle morphShapesToggle = new GUIToggle(new LocEdString("Morph shapes"), EditorStyles.Foldout);

                Layout.AddElement(morphShapesToggle);
                GUILayoutY channelsLayout = Layout.AddLayoutY();

                morphShapesToggle.OnToggled += x =>
                {
                    channelsLayout.Active = x;
                    Persistent.SetBool("Channels_Expanded", x);
                };

                channelsLayout.Active = Persistent.GetBool("Channels_Expanded");

                MorphChannel[] channels = morphShapes.Channels;
                for (int i = 0; i < channels.Length; i++)
                {
                    GUILayoutY channelLayout = channelsLayout.AddLayoutY();

                    GUILayoutX channelTitleLayout = channelLayout.AddLayoutX();
                    channelLayout.AddSpace(5);
                    GUILayoutY channelContentLayout = channelLayout.AddLayoutY();

                    string    channelName      = channels[i].Name;
                    GUIToggle channelNameField = new GUIToggle(channelName, EditorStyles.Expand, GUIOption.FlexibleWidth());

                    channelTitleLayout.AddSpace(15); // Indent
                    channelTitleLayout.AddElement(channelNameField);
                    channelTitleLayout.AddFlexibleSpace();

                    channelNameField.OnToggled += x =>
                    {
                        channelContentLayout.Active = x;

                        Persistent.SetBool(channelName + "_Expanded", x);
                    };

                    channelContentLayout.Active = Persistent.GetBool(channelName + "_Expanded");

                    MorphShape[] shapes = channels[i].Shapes;
                    for (int j = 0; j < shapes.Length; j++)
                    {
                        GUILayoutX shapeLayout = channelContentLayout.AddLayoutX();
                        channelContentLayout.AddSpace(5);

                        LocString nameString = new LocString("[{0}]. {1}");
                        nameString.SetParameter(0, j.ToString());
                        nameString.SetParameter(1, shapes[j].Name);
                        GUILabel shapeNameField = new GUILabel(shapes[j].Name);

                        LocString weightString = new LocEdString("Weight: {0}");
                        weightString.SetParameter(0, shapes[j].Weight.ToString());
                        GUILabel weightField = new GUILabel(weightString);

                        shapeLayout.AddSpace(30); // Indent
                        shapeLayout.AddElement(shapeNameField);
                        shapeLayout.AddFlexibleSpace();
                        shapeLayout.AddElement(weightField);
                    }
                }
            }
        }