protected void Edit(T item)
{
if (item == null)
{
item = new T();
}
selectedItem = item;
var vm = CreateViewModel(item);
var window = CreateWindow(vm);
window.ShowDialog();
if (vm.IsCancelled || item.Equals(vm.Setting))
{
return;
}
var index = SettingCollection.IndexOf(item);
if (index >= 0)
{
Remove(item);
SettingCollection.Insert(index, vm.Setting);
}
else
{
SettingCollection.Add(vm.Setting);
}
IsDirty = true;
}