public void ClearDrawing()
 {
     _drawings.Clear();
     _selectedDrawing = null;
 }
 public void InitiateSource()
 {
     _fiwps.Clear();
     _materials.Clear();
     _rulecredit.Clear();
     _drawings.Clear();
     
     _selectedMaterial = null;
     _selectedRulecredit = null;
     _selectedDrawing = null;
 }
        public void SelectDrawing(object select)
        {
            try
            {
                _selectedDrawing = null;
                if (select != null)
                    _selectedDrawing = select as DataItem;

            }
            catch { }
        }