Hiding a tab?

I'd like to show a tab view in a dialog with different amount of tabs depending on some variable.

However, the following code does not seem to work, it always shows two tabs (i.e. the visible -variable in the second tab_view_item is ignored).

f:tab_view {
     f:tab_view_item {
          visible = true,
          title = "Tab 1",
          identifier = "Tab1",
          f:static_text {
               title = "Some text to show"
          },
     },
     f:tab_view_item {
          visible = false,
          title = "Tab 2",
          identifier = "tab2",
     },

},

Is the syntax correct or is there any other way to make a tab with dynamically set number of tabs?

Thank you,

Keijo K.