public void DragDrop(object sender, DragEventArgs dragArgs)
{
DataContext = sender.As <FrameworkElement>().DataContext.As <TreeGroup>();
dragArgs
.GetFrom <ValueTag>()
.TryAs <IValueTag>()
?.Let(AddNewItem);
dragArgs
.GetFrom <VortexObjectDataTemplate>()
.TryAs <TreeWrapperObject>()
?.Let(AddNewItem);
dragArgs
.GetFrom <TreeItemTemplate>()
.TryAs <IValueTag>()
?.Let(AddToFavourites);
dragArgs.Handled = true;
}