TabbedView Binding

I am trying to do a basic TabbedView. The code below runs and when you tap each tab it updates to show the current selected page.

The problem is when I uncomment the Binding in AView. That triggers an error in ContentView:

$tabIndex is marked "ContentView.swift:14:31: Cannot convert value of type 'Binding<Int>' to expected argument type 'Binding<_>'"

Until I uncomment the Binding the TabbedView is perfectly happy to accept a Binding<Int> but once I want to use that binding problem!

Any ideas? Am I doing this all wrong?

struct ContentView : View {
    @State var tabIndex: Int = 1
    var body: some View {
        TabbedView(selection: $tabIndex){
            AView().tabItemLabel(
                Text("Page A: \($tabIndex.value)")
            ).tag(0)
            AView().tabItemLabel(
                Text("Page B: \($tabIndex.value)")
                ).tag(1)
            AView().tabItemLabel(
                Text("Page C: \($tabIndex.value)")
                ).tag(2)
        }
        
    }
}

struct AView : View {
//    @Binding private var tabIndex: Int
    var body: some View {
        Text("Hello World ")
    }
}