diff --git a/js/ui/components/keyring.js b/js/ui/components/keyring.js
index a211d002e..b791f0057 100644
--- a/js/ui/components/keyring.js
+++ b/js/ui/components/keyring.js
@@ -154,7 +154,7 @@ class KeyringDialog extends ModalDialog.ModalDialog {
         }
 
         this._controlTable = table;
-        this._content.messageBox.add_child(table);
+        this._content.add_child(table);
     }
 
     _updateSensitivity(sensitive) {
diff --git a/js/ui/components/networkAgent.js b/js/ui/components/networkAgent.js
index 6779b3147..63928f4a4 100644
--- a/js/ui/components/networkAgent.js
+++ b/js/ui/components/networkAgent.js
@@ -109,7 +109,7 @@ class NetworkSecretDialog extends ModalDialog.ModalDialog {
                 layout.attach(this._capsLockWarningLabel, 1, pos, 1, 1);
         }
 
-        contentBox.messageBox.add(secretTable);
+        contentBox.add_child(secretTable);
 
         if (flags & NM.SecretAgentGetSecretsFlags.WPS_PBC_ACTIVE) {
             let descriptionLabel = new St.Label({ style_class: 'prompt-dialog-description',
@@ -117,7 +117,7 @@ class NetworkSecretDialog extends ModalDialog.ModalDialog {
             descriptionLabel.clutter_text.line_wrap = true;
             descriptionLabel.clutter_text.ellipsize = Pango.EllipsizeMode.NONE;
 
-            contentBox.messageBox.add_child(descriptionLabel);
+            contentBox.add_child(descriptionLabel);
         }
 
         this._okButton = {
diff --git a/js/ui/components/polkitAgent.js b/js/ui/components/polkitAgent.js
index f4366c2ee..0a65fbdf6 100644
--- a/js/ui/components/polkitAgent.js
+++ b/js/ui/components/polkitAgent.js
@@ -62,7 +62,7 @@ var AuthenticationDialog = GObject.registerClass({
             style_class: 'polkit-dialog-user-layout',
             vertical: false,
         });
-        content.messageBox.add(userBox);
+        content.add_child(userBox);
 
         this._userAvatar = new UserWidget.Avatar(this._user, {
             iconSize: DIALOG_ICON_SIZE,
@@ -84,7 +84,7 @@ var AuthenticationDialog = GObject.registerClass({
         userBox.add_child(this._userLabel);
 
         this._passwordBox = new St.BoxLayout({ vertical: false, style_class: 'prompt-dialog-password-box' });
-        content.messageBox.add(this._passwordBox);
+        content.add_child(this._passwordBox);
         this._passwordLabel = new St.Label({
             style_class: 'prompt-dialog-password-label',
             y_align: Clutter.ActorAlign.CENTER,
@@ -110,18 +110,18 @@ var AuthenticationDialog = GObject.registerClass({
 
         this._passwordBox.hide();
         this._capsLockWarningLabel = new ShellEntry.CapsLockWarning({ style_class: 'prompt-dialog-caps-lock-warning' });
-        content.messageBox.add(this._capsLockWarningLabel);
+        content.add_child(this._capsLockWarningLabel);
 
         this._errorMessageLabel = new St.Label({ style_class: 'prompt-dialog-error-label' });
         this._errorMessageLabel.clutter_text.ellipsize = Pango.EllipsizeMode.NONE;
         this._errorMessageLabel.clutter_text.line_wrap = true;
-        content.messageBox.add_child(this._errorMessageLabel);
+        content.add_child(this._errorMessageLabel);
         this._errorMessageLabel.hide();
 
         this._infoMessageLabel = new St.Label({ style_class: 'prompt-dialog-info-label' });
         this._infoMessageLabel.clutter_text.ellipsize = Pango.EllipsizeMode.NONE;
         this._infoMessageLabel.clutter_text.line_wrap = true;
-        content.messageBox.add(this._infoMessageLabel);
+        content.add_child(this._infoMessageLabel);
         this._infoMessageLabel.hide();
 
         /* text is intentionally non-blank otherwise the height is not the same as for
@@ -133,7 +133,7 @@ var AuthenticationDialog = GObject.registerClass({
         this._nullMessageLabel.add_style_class_name('hidden');
         this._nullMessageLabel.clutter_text.ellipsize = Pango.EllipsizeMode.NONE;
         this._nullMessageLabel.clutter_text.line_wrap = true;
-        content.messageBox.add(this._nullMessageLabel);
+        content.add_child(this._nullMessageLabel);
         this._nullMessageLabel.show();
 
         this._cancelButton = this.addButton({ label: _("Cancel"),
diff --git a/js/ui/shellMountOperation.js b/js/ui/shellMountOperation.js
index 98989ce40..f55f2a9b1 100644
--- a/js/ui/shellMountOperation.js
+++ b/js/ui/shellMountOperation.js
@@ -306,14 +306,14 @@ var ShellMountPasswordDialog = GObject.registerClass({
             });
 
             this._hiddenVolume = new CheckBox.CheckBox(_("Hidden Volume"));
-            content.messageBox.add(this._hiddenVolume);
+            content.add_child(this._hiddenVolume);
 
             this._systemVolume = new CheckBox.CheckBox(_("Windows System Volume"));
-            content.messageBox.add(this._systemVolume);
+            content.add_child(this._systemVolume);
 
             this._keyfilesCheckbox = new CheckBox.CheckBox(_("Uses Keyfiles"));
             this._keyfilesCheckbox.connect("clicked", this._onKeyfilesCheckboxClicked.bind(this));
-            content.messageBox.add(this._keyfilesCheckbox);
+            content.add_child(this._keyfilesCheckbox);
 
             this._keyfilesLabel.clutter_text.set_markup(
                 /* Translators: %s is the Disks application */
@@ -321,7 +321,7 @@ var ShellMountPasswordDialog = GObject.registerClass({
             );
             this._keyfilesLabel.clutter_text.ellipsize = Pango.EllipsizeMode.NONE;
             this._keyfilesLabel.clutter_text.line_wrap = true;
-            content.messageBox.add_child(this._keyfilesLabel);
+            content.add_child(this._keyfilesLabel);
 
             this._pimLabel = new St.Label({ style_class: 'prompt-dialog-password-label',
                                             text: _("PIM Number"),
@@ -380,20 +380,20 @@ var ShellMountPasswordDialog = GObject.registerClass({
             layout.attach(this._capsLockWarningLabel, 1, 2, 1, 1);
         }
 
-        content.messageBox.add(grid);
+        content.add_child(grid);
 
         this._errorMessageLabel = new St.Label({ style_class: 'prompt-dialog-error-label',
                                                  text: _("Sorry, that didn’t work. Please try again.") });
         this._errorMessageLabel.clutter_text.ellipsize = Pango.EllipsizeMode.NONE;
         this._errorMessageLabel.clutter_text.line_wrap = true;
         this._errorMessageLabel.hide();
-        content.messageBox.add(this._errorMessageLabel);
+        content.add_child(this._errorMessageLabel);
 
         if (flags & Gio.AskPasswordFlags.SAVING_SUPPORTED) {
             this._rememberChoice = new CheckBox.CheckBox(_("Remember Password"));
             this._rememberChoice.checked =
                 global.settings.get_boolean(REMEMBER_MOUNT_PASSWORD_KEY);
-            content.messageBox.add(this._rememberChoice);
+            content.add_child(this._rememberChoice);
         } else {
             this._rememberChoice = null;
         }