Flex-built Component doesn't drag onto Stage

I’m working with a fellow coder on a project; he’s the Flex guy and I’m the Flash guy. He supplied me with a custom Component he built in Flex, to act as an API. It’s working just fine for him when he runs it in Flex.
I installed the .swc file in my Components folder. When I open my Components window, I can see it sitting right there. However, I can’t seem to drag an instance of it onto the Stage. It highlights in the window when I click it, as I drag it I can see the little dotted-outline box indicating that something’s being dragged, but when I release it it disappears. Nothing on the Stage, nothing in the Library.
We’re both stumped. Anyone here ever run into this problem? Many thanks.