private void Copy()
 {
     if (dataGrid.SelectedItem is TechnologyTier technologyTier)
     {
         CopyTechnologyTier = technologyTier;
     }
 }
 private void Paste()
 {
     if (CopyTechnologyTier is TechnologyTier technologyTier)
     {
         TechnologyTier pdxTechnologyTier = technologyTier.Clone();
         pdxTechnologyTier.Key = pdxTechnologyTier.Key + "_copy";
         TechnologyTiers.Insert(TechnologyTiers.IndexOf(technologyTier), pdxTechnologyTier);
     }
 }