void PieGraphLeftClick(BaseGraph sender, object key, object value)
{
label2.Content = "\n\n\nClick on a piece of the pie to read its information.\n\n\nKey: " + key.ToString() + "\nValue: " + value.ToString();
}
void BarGraphMouseOver(BaseGraph sender, object key, object value)
{
label1.Content = "Mouse over a bar to read its information.\n\n\nKey: " + key.ToString() + "\nValue: " + value.ToString();
}