public OperationProgressViewModel()
{
Callbacks = new ExportCallbacks(() => _shouldAbort, OperationCompleted, TotalToProcessChanged, CurrentlyProcessedChanged);
AbortCommand = new Command(p => _shouldAbort = true, p => (_shouldAbort == false));
}
public void Export(string source, string dest, CallbacksBase exportCallbacks)
{
if (exportCallbacks == null) exportCallbacks = new ExportCallbacks();
_fileSystem.Export(FindNode(source), dest, exportCallbacks);
}