void _ShowItemDistribution()
{
    this.Text = "Item Distribution";
    ShowItemDistribution(new List<ItemDistributionSeries>()
    {
        new ItemDistributionSeries{Name = "Item 1", Value = 123},
        new ItemDistributionSeries{Name = "Item 2", Value = 234},
        new ItemDistributionSeries{Name = "Item 3", Value = 312}
    }, " Items");
}