Multi Selection Listview

Hey guys, I am following the multi selection list view procedure from the Xamarin website (https://developer.xamarin.com/recipes/cross-platform/xamarin-forms/controls/multiselect/) to implement in my app. I have set up everything and the multi selection works fine, but the page doesn't remember the values that are already selected.

What the page does is, it creates a list and initialises IsSelected property to false, so when I call the function that utilises this page, all the items are deselected, even if I had selected data before. Does anyone know how to set up the page so it remembers the switch selection state?

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