UnityEditor.AudioMixerGroupSelector.TreeViewArea C# (CSharp) Method

        private void TreeViewArea(Rect treeViewRect)
        {
            int controlID = GUIUtility.GetControlID("Tree".GetHashCode(), FocusType.Keyboard);
            GUIUtility.keyboardControl = controlID;
            if (this.m_TreeView.data.GetVisibleRows().Count > 0)
            {
                this.m_TreeView.OnGUI(treeViewRect, controlID);
            }
            else
            {
                EditorGUI.BeginDisabledGroup(true);
                GUILayout.BeginHorizontal(new GUILayoutOption[0]);
                GUILayout.FlexibleSpace();
                GUILayout.Label(GUIContent.Temp("No Audio Mixers available"), new GUILayoutOption[0]);
                GUILayout.FlexibleSpace();
                EditorGUI.EndDisabledGroup();
            }
        }