In Qt Creator 3.6.1, it was possible to use the QML/JS Console to interact with QML objects while the application is running in debug mode. This is no longer possible with Qt Creator 4.0. You can set a breakpoint and pause the application to use the Debugger Console but it is not the same because functions you call from the console may require the event loop to continue running. This means you need to continue the application and then pause it again every time you call a function that requires the event loop to be running.