To make the chart data more readable, a listbox is required to be added to filter the categories from the data.

Perform the following steps to filter the categories from the data:

1. From the Visual Studio Toolbox, double-click the ListBox control to add it to the form.
2. Dock the ListBox control to the left of the FlexChart control so it appears like the following:
   
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3. Select the ListBox control, and then click on its smart tag.
4. Select Use Data Bound items.
5. In the Data Source drop-down listbox, select Categories from Other Data Sources>Project Data Sources>categoriesDataSet.
   
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6. Select CategoryName in the Display Member drop-down listbox.
7. Double-click on the ListBox control to generate a listbox1_SelectedIndexChanged event.
8. Add the following code in the listbox1_SelectedIndexChanged event to filter the CategoryID to the listbox when the user selects a category item:
   

   Title Text	Copy Code
   Type your code here.

9. In the Form1_Load event, add the following code to force the new calculation after the refill so the first category of product items, Beverages, appears rather than all of the unfiltered categories:
   
   

   Title Text	Copy Code
   Type your code here.

10. Run the application and select a category from the listbox to observe the chart filter the data.

The listbox is bound to the dataset successfully, as shown below:

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