Enable selecting multiple items from the dropdown list.
    In this demo the Products dropdown has Multiple="true" with two products pre-selected (IDs 1 and 2), using TextProperty and ValueProperty to display product names while binding to product IDs.
    Use Chips="true" to display selected items as removable chips in the dropdown.
    Use MaxSelectedLabels to limit displayed items and SelectedItemsText to show a custom message when many items are selected.
    Use EqualityComparer to define custom comparison logic for determining when items are equal.
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