Final answer:
In a data-bound control within a graphical user interface, clicking on the 'smart tag' will open a task panel with options for configuring the control.
Step-by-step explanation:
When working with a data-bound control in a graphical user interface designer, such as those in .NET frameworks (e.g., Windows Forms, ASP.NET), the smart tag is a small icon that usually appears next to a control when it is selected. Clicking on the smart tag will cause a task panel to appear, which provides various options for configuring the control, binding it to data sources, and customizing its behavior without writing any code.