private void IntializeDir()
        {
            string[] files = Directory.GetFiles(@".\", "*.*");
            pathCollection.AddPaths(files);

            PreViewCtl.ReplaceContent(pathCollection.GetPathByIndex(0));
            Next = new RelayCommand(NextFile);
            Last = new RelayCommand(LastFile);
        }
 private void LastFile()
 {
     PreViewCtl.ReplaceContent(pathCollection.GetPreviousPath());
 }
 private void NextFile()
 {
     PreViewCtl.ReplaceContent(pathCollection.GetNextPath());
 }