/// <inheritdoc />
protected override void UpdateCommands()
{
base.UpdateCommands();
var allSiblings = SelectedItems.AllSiblings();
var atLeastOne = SelectedItems.Count >= 1;
var exactlyOne = SelectedItems.Count == 1;
CreateLibraryCommand.IsEnabled = atLeastOne;
CreatePageCommand.IsEnabled = exactlyOne;
DuplicateSelectionCommand.IsEnabled = atLeastOne && GetCommonRoots(SelectedItems).All(e => e.CanDuplicate());
GroupIntoCommand.IsEnabled = atLeastOne && allSiblings;
var libraryInstanceSelected = SelectedItems.Any(x => x.SourceLibrary != null);
BreakLinkToLibraryCommand.IsEnabled = libraryInstanceSelected;
OpenLibraryEditorCommand.IsEnabled = libraryInstanceSelected;
SelectLibraryCommand.IsEnabled = libraryInstanceSelected && exactlyOne;
}