That's a good question came up after the series in my blog. Someone asked why should one use Custom Control instead of User Control? Hence, let's extend the series and discuss about that. I apologise the delay of this post. I should explain this at the start of the series, but actually my goal was to explain you how to create and use Custom Control in Silverlight.
It is better to do it later than never. Also, you are now familiar with Custom Control creation. Hence, start describing it. You will come to know more about this here. As always, don't forget to share your feedback at the end of this page.
Hope, this information will help you to understand the difference between Custom Control and User Control. Also, it will help you to understand the use of each. Now, you will be able to decide where to use which one.