Fix for empty toolbar issue

interface/resources/qml/hifi/toolbars/Toolbar.qml

@@ -125,9 +125,6 @@ Window {
     }
 
     function addButton(properties) {
-
-        visible = true;
-
         properties = properties || {}
 
         // If a name is specified, then check if there's an existing button with that name

libraries/script-engine/src/TabletScriptingInterface.cpp

@@ -14,6 +14,7 @@
 #include "DependencyManager.h"
 #include <PathUtils.h>
 #include <QmlWindowClass.h>
+#include <QQmlProperty>
 #include <RegisteredMetaTypes.h>
 #include "ScriptEngineLogging.h"
 #include <OffscreenUi.h>
@@ -543,6 +544,9 @@ void TabletProxy::addButtonsToToolbar() {
             qCWarning(scriptengine) << "ToolbarProxy addButton has no result";
         }
     }
+
+    // make the toolbar visible
+    QMetaObject::invokeMethod(toolbarProxy, "writeProperty", Qt::AutoConnection, Q_ARG(QString, "visible"), Q_ARG(QVariant, QVariant(true)));
 }
 
 void TabletProxy::removeButtonsFromToolbar() {

libraries/script-engine/src/TabletScriptingInterface.h

@@ -173,7 +173,7 @@ signals:
     void fromQml(QVariant msg);
 
     /**jsdoc
-     * Signales when this tablet screen changes.
+     * Signaled when this tablet screen changes.
      * @function TabletProxy#screenChanged
      * @param type {string} - "Home", "Web", "Menu", "QML", "Closed"
      * @param url {string} - only valid for Web and QML.