public List<Drawing> ShowViewToSelectManyDialog()
 {
     var slctForm = new TopDrawingsSelectionForm(this);
     _slctedDraws = new List<Drawing>();
     slctForm.OnSelectDrawings += SlctForm_OnSelectDrawings;
     slctForm.ShowDialog();
     return _slctedDraws;
 }
 public Drawing ShowViewToSelectOneDialog()
 {
     var slctForm = new TopDrawingsSelectionForm(this);
     _slctedDraws = new List<Drawing>();
     slctForm.OnSelectDrawings += SlctForm_OnSelectDrawings;
     slctForm.ShowDialog();
     return _slctedDraws.Count > 0 ? _slctedDraws[0] : null;
 }