public BaseDataGridColumn()
{
// TODO: move this to cached FunctionCompiler so it doesn't get compiled every time
valueTypeGetter = new Lazy <Func <Type> >(() => FunctionCompiler.CreateValueTypeGetter <TItem>(Field));
defaultValueByType = new Lazy <Func <object> >(() => FunctionCompiler.CreateDefaultValueByType <TItem>(Field));
valueGetter = new Lazy <Func <TItem, object> >(() => FunctionCompiler.CreateValueGetter <TItem>(Field));
valueSetter = new Lazy <Action <TItem, object> >(() => FunctionCompiler.CreateValueSetter <TItem>(Field));
}