Lines 45?51 create the new data provider and assign it to the selectedEmployeeSales variable.Chapter 11: Charting Components 281 ? 123 You bind the visibility of the Panel that contains the ColumnChart to the conditional statement selectedEmployeeSales = null, so after selectedEmployeeSales is set to anything other than null, this Panel is shown.? 131 When a new employee is selected, the ColumnCha