UnityEditor.AudioMixersTreeViewGUI.BeginCreateNewMixer C# (CSharp) Method

        public void BeginCreateNewMixer()
        {
            this.ClearRenameAndNewItemState();
            string newAssetResourceFile = string.Empty;
            AudioMixerItem selectedItem = this.GetSelectedItem();
            if ((selectedItem != null) && (selectedItem.mixer.outputAudioMixerGroup != null))
            {
                newAssetResourceFile = selectedItem.mixer.outputAudioMixerGroup.GetInstanceID().ToString();
            }
            int instanceID = 0;
            if (this.GetCreateAssetUtility().BeginNewAssetCreation(instanceID, ScriptableObject.CreateInstance<DoCreateAudioMixer>(), "NewAudioMixer.mixer", null, newAssetResourceFile))
            {
                this.SyncFakeItem();
                if (!base.GetRenameOverlay().BeginRename(this.GetCreateAssetUtility().originalName, instanceID, 0f))
                {
                    Debug.LogError("Rename not started (when creating new asset)");
                }
            }
        }

        public void OnGUI(Rect rect)
        {
            int controlID = GUIUtility.GetControlID(FocusType.Keyboard);

            if (AudioMixersTreeView.s_Styles == null)
            {
                AudioMixersTreeView.s_Styles = new AudioMixersTreeView.Styles();
            }
            this.m_TreeView.OnEvent();
            Rect r;
            Rect rect2;

            AudioMixerDrawUtils.DrawRegionBg(rect, out r, out rect2);
            AudioMixerDrawUtils.HeaderLabel(r, AudioMixersTreeView.s_Styles.header, AudioMixersTreeView.s_Styles.audioMixerIcon);
            if (GUI.Button(new Rect(r.xMax - 15f, r.y + 3f, 15f, 15f), AudioMixersTreeView.s_Styles.addText, EditorStyles.label))
            {
                AudioMixersTreeViewGUI audioMixersTreeViewGUI = this.m_TreeView.gui as AudioMixersTreeViewGUI;
                audioMixersTreeViewGUI.BeginCreateNewMixer();
            }
            this.m_TreeView.OnGUI(rect2, controlID);
            if (this.m_TreeView.data.rowCount == 0)
            {
                using (new EditorGUI.DisabledScope(true))
                {
                    GUI.Label(new RectOffset(-20, 0, -2, 0).Add(rect2), "No mixers found");
                }
            }
            AudioMixerDrawUtils.DrawScrollDropShadow(rect2, this.m_TreeView.state.scrollPos.y, this.m_TreeView.gui.GetTotalSize().y);
            this.HandleCommandEvents(controlID);
            this.HandleObjectSelectorResult();
        }