Use Windows to make a copy of the Gross Pay Solution-Sub folder from Lesson A. Rename the copy Gross Pay Solution-Sub-ComboBox. Open the Gross Pay Solution (Gross Pay Solution.sln) file contained in the Gross Pay Solution-Sub-ComboBox folder. Open the designer window. Replace the Hours list box with a DropDownList combo box. Make the necessary modifications to the code. Save the solution and then start and test the application. Close the Code Editor window and then close the solution.