private void ItemGroupDefinitions_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.NewItems != null)
{
foreach (var item in e.NewItems)
{
if (item is CommandBarGroupDefinition groupDefinition)
{
var items = ItemDefinitions.Where(x => x.Group == groupDefinition);
foreach (var itemDefinition in items)
{
if (!groupDefinition.Items.Contains(itemDefinition))
{
groupDefinition.Items.AddSorted(itemDefinition,
new SortOrderComparer <CommandBarDefinitionBase>());
}
}
}
}
}
if (e.OldItems != null)
{
foreach (var item in e.OldItems)
{
if (item is CommandBarGroupDefinition groupDefinition)
{
groupDefinition.Parent.ContainedGroups.Remove(groupDefinition);
groupDefinition.Items.Clear();
}
}
}
}