design time support - use dropdown list

Question

This is a a design time support program. In this program, when select(view the properties) the 'phoneNumberControl1' usercontrol (which having Name,CountryCode,AreaCode,Phone#); it appears a section called "PhoneData" in the properties section. by using this "PhoneData" section, we can give the desired values to Name,CountryCode,AreaCode,Phone# at design time. And those will be appear on the textboxes. It works fine! But,i need to use a dropdown list there.Need to enter the country code from a Dropdown list or something like that.(Otherthen typing there.) How to do this?? (in the other program, it give the drop down list.Select the BULE color rectangle.in there its property - RectHeight,RectWidth can be choose from the dropdown list.) How can i do this for the above program. i.e: Getting the CountryCode from a dropdown list. Program: -Run the "CustomEditor.sln", which is in the CustomEditor folder. -(Inside that)Then open the "WindowsApplication1 - > Form1.cs" in the "Design Viewer" -Then set the properties at the design time as mentioned. (Note: this is a design time support program.) Program Can be Found Here: http://rapidshare.com/files/35367970/CustomEditor_demo.rar.html OR http://www.MegaShare.com/194407 OR http://www.codeproject.com/csharp/PropertyEditor.asp need help!