void DrawChartboostSettings()
        {
            EditorGUILayout.Space();
            DrawUppercaseSection("CHARTBOOST_SETUP_FOLDOUT_KEY", "CHARTBOOST", () =>
            {
                    #if !EM_CHARTBOOST
                EditorGUILayout.HelpBox(ChartboostImportInstruction, MessageType.Warning);
                if (GUILayout.Button("Download Chartboost Plugin", GUILayout.Height(EM_GUIStyleManager.buttonHeight)))
                {
                    EM_ExternalPluginManager.DownloadChartboostPlugin();
                }
                    #else
                EditorGUILayout.HelpBox(ChartboostAvailMsg, MessageType.Info);
                if (GUILayout.Button("Download Chartboost Plugin", GUILayout.Height(EM_GUIStyleManager.buttonHeight)))
                {
                    EM_ExternalPluginManager.DownloadChartboostPlugin();
                }

                // Placements.
                EditorGUILayout.Space();
                EditorGUILayout.LabelField("Default Placement", EditorStyles.boldLabel);
                EditorGUILayout.HelpBox(ChartboostDefaultAdPlacementMsg, MessageType.None);

                // Custom Placements.
                EditorGUILayout.Space();
                EditorGUILayout.LabelField("Custom Placements", EditorStyles.boldLabel);
                EditorGUILayout.HelpBox(ChartboostCustomAdPlacementMsg, MessageType.None);

                EditorGUI.indentLevel++;
                if (DrawPropertyAsResizableArray(AdProperties.chartboostCustomInterstitialPlacements.property, AdProperties.chartboostCustomInterstitialPlacements.content, null, null, true))
                {
                    DrawAllElementsInArrayProperty(AdProperties.chartboostCustomInterstitialPlacements.property);
                }
                EditorGUI.indentLevel--;

                EditorGUI.indentLevel++;
                if (DrawPropertyAsResizableArray(AdProperties.chartboostCustomRewardedPlacements.property, AdProperties.chartboostCustomRewardedPlacements.content, null, null, true))
                {
                    DrawAllElementsInArrayProperty(AdProperties.chartboostCustomRewardedPlacements.property);
                }
                EditorGUI.indentLevel--;

                // Setup.
                EditorGUILayout.Space();
                EditorGUILayout.LabelField("Setup", EditorStyles.boldLabel);
                EditorGUILayout.HelpBox("Chartboost can be setup in dedicated window.", MessageType.None);
                if (GUILayout.Button("Setup Chartboost", GUILayout.Height(EM_GUIStyleManager.buttonHeight)))
                {
                    // Open Chartboost settings window.
                    ChartboostSDK.CBSettings.Edit();
                }
                    #endif
            });
        }
        void AdModuleGUI()
        {
            EditorGUILayout.BeginVertical(EM_GUIStyleManager.GetCustomStyle("Module Box"));

            EditorGUI.BeginChangeCheck();
            isAdModuleEnable.boolValue = EM_EditorGUI.ModuleToggle(isAdModuleEnable.boolValue, AdModuleLabel);
            if (EditorGUI.EndChangeCheck())
            {
                GameObject prefab = EM_EditorUtil.GetMainPrefab();

                if (!isAdModuleEnable.boolValue)
                {
                    EM_Manager.DisableAdModule(prefab);
                }
                else
                {
                    EM_Manager.EnableAdModule(prefab);
                }
            }

            // Now draw the GUI.
            if (!isAdModuleEnable.boolValue)
            {
                EditorGUILayout.Space();
                EditorGUILayout.HelpBox(AdModuleIntro, MessageType.Info);
            }
            else
            {
                // AdMob setup
                EditorGUILayout.Space();
                EditorGUILayout.LabelField("ADMOB SETUP", EditorStyles.boldLabel);

                #if !EM_ADMOB
                EditorGUILayout.HelpBox(AdMobImportInstruction, MessageType.Warning);
                EditorGUILayout.Space();
                if (GUILayout.Button("Download Google Mobile Ads Plugin", GUILayout.Height(EM_GUIStyleManager.buttonHeight)))
                {
                    EM_ExternalPluginManager.DownloadGoogleMobileAdsPlugin();
                }
                #else
                EditorGUILayout.HelpBox(AdMobAvailMsg, MessageType.Info);
                EditorGUILayout.Space();
                if (GUILayout.Button("Download Google Mobile Ads Plugin", GUILayout.Height(EM_GUIStyleManager.buttonHeight)))
                {
                    EM_ExternalPluginManager.DownloadGoogleMobileAdsPlugin();
                }
                EditorGUILayout.Space();
                EditorGUI.indentLevel++;
                EditorGUILayout.PropertyField(AdProperties.iosAdMobConfig.property, AdProperties.iosAdMobConfig.content, true);
                EditorGUILayout.PropertyField(AdProperties.androidAdMobConfig.property, AdProperties.androidAdMobConfig.content, true);
                EditorGUI.indentLevel--;
                #endif

                // Chartboost setup
                EditorGUILayout.Space();
                EditorGUILayout.LabelField("CHARTBOOST SETUP", EditorStyles.boldLabel);

                #if !EM_CHARTBOOST
                EditorGUILayout.HelpBox(ChartboostImportInstruction, MessageType.Warning);
                EditorGUILayout.Space();
                if (GUILayout.Button("Download Chartboost Plugin", GUILayout.Height(EM_GUIStyleManager.buttonHeight)))
                {
                    EM_ExternalPluginManager.DownloadChartboostPlugin();
                }
                #else
                EditorGUILayout.HelpBox(ChartboostAvailMsg, MessageType.Info);
                EditorGUILayout.Space();
                if (GUILayout.Button("Download Chartboost Plugin", GUILayout.Height(EM_GUIStyleManager.buttonHeight)))
                {
                    EM_ExternalPluginManager.DownloadChartboostPlugin();
                }
                if (GUILayout.Button("Setup Chartboost", GUILayout.Height(EM_GUIStyleManager.buttonHeight)))
                {
                    // Open Chartboost settings window.
                    ChartboostSDK.CBSettings.Edit();
                }
                #endif

                // Heyzap setup
                EditorGUILayout.Space();
                EditorGUILayout.LabelField("HEYZAP SETUP", EditorStyles.boldLabel);

                #if !EM_HEYZAP
                EditorGUILayout.HelpBox(HeyzapImportInstruction, MessageType.Warning);
                EditorGUILayout.Space();
                if (GUILayout.Button("Download Heyzap Plugin", GUILayout.Height(EM_GUIStyleManager.buttonHeight)))
                {
                    EM_ExternalPluginManager.DownloadHeyzapPlugin();
                }
                #else
                EditorGUILayout.HelpBox(HeyzapAvailMsg, MessageType.Info);
                EditorGUILayout.Space();
                if (GUILayout.Button("Download Heyzap Plugin", GUILayout.Height(EM_GUIStyleManager.buttonHeight)))
                {
                    EM_ExternalPluginManager.DownloadHeyzapPlugin();
                }
                EditorGUILayout.Space();
                AdProperties.heyzapPublisherId.property.stringValue = EditorGUILayout.TextField(AdProperties.heyzapPublisherId.content, AdProperties.heyzapPublisherId.property.stringValue);
                AdProperties.heyzapShowTestSuite.property.boolValue = EditorGUILayout.Toggle(AdProperties.heyzapShowTestSuite.content, AdProperties.heyzapShowTestSuite.property.boolValue);
                #endif

                // UnityAds setup
                EditorGUILayout.Space();
                EditorGUILayout.LabelField("UNITY ADS SETUP", EditorStyles.boldLabel);

                #if !UNITY_ADS
                EditorGUILayout.HelpBox(UnityAdsUnvailableWarning, MessageType.Warning);
                #else
                EditorGUILayout.HelpBox(UnityAdsAvailableMsg, MessageType.Info);
                #endif

                // Ads auto-load setup
                EditorGUILayout.Space();
                EditorGUILayout.LabelField("AUTO AD-LOADING CONFIG", EditorStyles.boldLabel);
                AdProperties.autoLoadDefaultAds.property.boolValue  = EditorGUILayout.Toggle(AdProperties.autoLoadDefaultAds.content, AdProperties.autoLoadDefaultAds.property.boolValue);
                AdProperties.adCheckingInterval.property.floatValue = EditorGUILayout.FloatField(AdProperties.adCheckingInterval.content, AdProperties.adCheckingInterval.property.floatValue);
                AdProperties.adLoadingInterval.property.floatValue  = EditorGUILayout.FloatField(AdProperties.adLoadingInterval.content, AdProperties.adLoadingInterval.property.floatValue);

                EditorGUILayout.Space();
                EditorGUILayout.LabelField("DEFAULT AD NETWORKS", EditorStyles.boldLabel);
                EditorGUI.indentLevel++;
                EditorGUILayout.PropertyField(AdProperties.iosDefaultAdNetworks.property, AdProperties.iosDefaultAdNetworks.content, true);
                EditorGUILayout.PropertyField(AdProperties.androidDefaultAdNetworks.property, AdProperties.androidDefaultAdNetworks.content, true);
                EditorGUI.indentLevel--;

                // Now check if there's any default ad network that doesn't have plugin imported and show warnings.

                AdSettings.DefaultAdNetworks iosDefault     = EM_Settings.Advertising.IosDefaultAdNetworks;
                AdSettings.DefaultAdNetworks androidDefault = EM_Settings.Advertising.AndroidDefaultAdNetworks;
                List <AdNetwork>             usedNetworks   = new List <AdNetwork>();
                AddWithoutRepeat(usedNetworks, (AdNetwork)iosDefault.bannerAdNetwork);
                AddWithoutRepeat(usedNetworks, (AdNetwork)iosDefault.interstitialAdNetwork);
                AddWithoutRepeat(usedNetworks, (AdNetwork)iosDefault.rewardedAdNetwork);
                AddWithoutRepeat(usedNetworks, (AdNetwork)androidDefault.bannerAdNetwork);
                AddWithoutRepeat(usedNetworks, (AdNetwork)androidDefault.interstitialAdNetwork);
                AddWithoutRepeat(usedNetworks, (AdNetwork)androidDefault.rewardedAdNetwork);

                bool addedSpace = false;

                foreach (AdNetwork network in usedNetworks)
                {
                    if (!IsPluginAvail(network))
                    {
                        if (!addedSpace)
                        {
                            EditorGUILayout.Space();
                            addedSpace = true;
                        }
                        EditorGUILayout.HelpBox("Default ad network " + network.ToString() + " has no SDK. Please import its plugin.", MessageType.Warning);
                    }
                }
            }

            EditorGUILayout.EndVertical();
        }