public static void Update <TItem>(IDataGrid grid,
Func <TItem, bool> getSelected)
where TItem : class, new()
{
var grd = grid.As <DataGrid <TItem, object> >();
var toolbar = grd.Element.Children(".s-Toolbar");
if (toolbar.Length == 0)
{
return;
}
var btn = toolbar.GetWidget <Toolbar>()
.FindButton("select-all-button");
var items = grd.View.GetItems();
btn.ToggleClass("checked", items.Count > 0 && !items.Some(x => !getSelected(x)));
}
