How to make my control <B>Invisible at runtime</B>

Visual C++ 6.0
ATL 3.0

After I create a control named A with ATL Wizard, I found the control should be &lt;B&gt;Invisible at runtime&lt;/B&gt;.
How to make the control &lt;B&gt;Invisible at runtime&lt;/B&gt;?

By the way, how to determine current status is runtime or design-time?