public ModelListFormBaseManager(ModelListFormBase form, DatabaseBase <TModel> boundCollection, ColumnDescriptorCreatorDelegate baseColumnCreatorMethod)
     : base(form, boundCollection, baseColumnCreatorMethod)
 {
 }
 public ItemListFormBaseManager(ItemListFormBase form, IObservableEnumerable <TItem> boundCollection, ColumnDescriptorCreatorDelegate baseColumnCreatorMethod)
 {
     this.form            = form;
     this.boundCollection = boundCollection;
     columnDescriptorCreators.Add(baseColumnCreatorMethod);
 }