To understand my question first see the image below:
<img src="http://i.imgur.com/wbFfC.jpg" alt="Loading image..." border="0" />
br mode="hold" />This is the picture of the combo box in the editor window. I just want to create a custom control like this. Here I want to know how can I implement this "Tasks" features for my own control?
For example I want to create a Visible Digital Countdown control. I want to make a Tasks feature here to set the time to countdown.
How can I implement that?