TDBAdvControlDropDown

Anybody has a working code of how to get this DBAdvControlDropDown to actually drop down the assigned control?
I have assigned the control both at design time and at runtime, but when I click on the dropdown button nothing happens, except for the form itself flickering.
How do you actually implement this control, is it working?

Is there anything special about this control ? Did you try this for example with a simple TMemo ?
I cannot reproduce any issue with this. If a problem persists, can you please provide more details?