WPF Master/Detail data binding between 2 combobox

Question

I have two combobox where Parent has to show the list of Countries and the child combo has to show a list of cities of the choosen country. The data is stored in a Diction

Answer 1

If your dictionary CountriesCitiesList contains country Id as Key and List as cities name, you can bind it in pure xaml way something like this -

I am assuming you want to show country Id's in cbCountriesList since you are binding it to the dictionary with key of int type.