public void AddVegetationPackage(VegetationPackagePro vegetationPackagePro)
 {
     if (!VegetationPackageProList.Contains(vegetationPackagePro))
     {
         VegetationPackageProList.Add(vegetationPackagePro);
     }
 }
 public void RemoveVegetationPackage(VegetationPackagePro vegetationPackagePro)
 {
     VegetationPackageProList.Remove(vegetationPackagePro);
 }