Cant' navigate through the pages of a survey using surveyJS

I'm using the library SurveyJS in my angular project. I need to be able to navigate through pages programmatically. My first attempt was:

this.survey.currentPageNo = 5;  //navigate to page 5.

Unfortunately it didn't work. So I checked the documentation about this field and it states that:

A zero-based index of the current page in the visiblePages array.

So, I'm only allowed to navigate throught visible pages. My survey has 10 pages, so this.survey.pages.length = 10, but this.survey.visiblePages.length = 1, it means that only the first page is visible. According to the documentation, I should be able to set the page visibility by adding a "visible" : true to the page configuration. So in my case it would be something like:

"pages": [
    {
        "elements": [
            //list of elements
        ],
        "visible": true,
        "name": "page1"
    },

    {
        "elements": [
            //list of elements
        ],
        "visible": true,
        "name": "page2"
    }
]

but visiblePages.length is still 1... What am I missing? Thanks in advance