xamarin - How add Event EventHandler in xaml? -

i have custom picker property

public eventhandler selectedindexchanged { get; set; } 

and want set property xaml. genderpicker.selectedindexchanged += genderpicker_onselectedindexchanged; xaml

    <elements:custompicker    selectedindexchanged="{what write there???}"/> 

just write name of method handle_selectedindexchanged , make sure create method in code-behind of page using control, right signature, instance:

private void handle_selectedindexchanged(object sender, eventargs rags) {     // ... code }