public void ReplaceSelectedExecuted(string materialName)
        {
            MainViewModel.IsBusy = true;
            var sourceFile = DataModel.SourceVoxelFilepath ?? DataModel.VoxelFilepath;

            var asteroid = new MyVoxelMap();

            asteroid.Load(sourceFile, SpaceEngineersCore.Resources.GetDefaultMaterialName(), true);

            if (string.IsNullOrEmpty(materialName))
            {
                asteroid.RemoveContent(SelectedMaterialAsset.MaterialName, null);
                DataModel.VoxCells = asteroid.SumVoxelCells();
            }
            else
            {
                asteroid.ReplaceMaterial(SelectedMaterialAsset.MaterialName, materialName);
            }

            var tempfilename = TempfileUtil.NewFilename(MyVoxelMap.V2FileExtension);

            asteroid.Save(tempfilename);
            DataModel.SourceVoxelFilepath = tempfilename;

            MainViewModel.IsModified = true;
            MainViewModel.IsBusy     = false;

            DataModel.UpdateGeneralFromEntityBase();
            DataModel.MaterialAssets = null;
            DataModel.InitializeAsync();
        }