public ColumnConfigurationViewModel(string configurationName, ObservableCollection <FieldMapperGridColumn> columns)
: base(typeof(ColumnConfigurationViewModel))
{
ConfigurationName = configurationName;
Columns = columns;
_selectedColumns = new FilteredReadOnlyObservableCollection <FieldMapperGridColumn>(columns, (x) => x.Visible);
_availableColumns = new FilteredReadOnlyObservableCollection <FieldMapperGridColumn>(columns, (x) => !x.Visible);
ShowColumnCommand = new RelayCommand((o) => ShowColumn(), (o) => SelectedInvisibleColumn != null);
HideColumnCommand = new RelayCommand((o) => HideColumn(), (o) => SelectedVisibleColumn != null);
OKCommand = new RelayCommand((o) => OK());
MoveSelectedUpCommand = new RelayCommand((o) => MoveSelectedUp(), (o) => SelectedVisibleColumn != null && SelectedVisibleColumn != SelectedColumns.FirstOrDefault());
MoveSelectedDownCommand = new RelayCommand((o) => MoveSelectedDown(), (o) => SelectedVisibleColumn != null && SelectedVisibleColumn != SelectedColumns.LastOrDefault());
MoveAvailableUpCommand = new RelayCommand((o) => MoveAvailableUp(), (o) => SelectedInvisibleColumn != null && SelectedInvisibleColumn != AvailableColumns.FirstOrDefault());
MoveAvailableDownCommand = new RelayCommand((o) => MoveAvailableDown(), (o) => SelectedInvisibleColumn != null && SelectedInvisibleColumn != AvailableColumns.LastOrDefault());
}
