Just type "Combo" in the Based on text field and select either the Spark ComboBox or MX ComboBox control from the pop up menu.
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A bit of clarification on the dialog.
In Flash Builder 4, we updated the "Based on" dialog to behave like the Eclipse JDT. Instead of showing every component when no query is specified, we just show the history of components. To find a particular component, you'll need to know something about it's name. Searching for "spark." or "halo." will search for classes in all descendant packages.
Jason San Jose
Software Engineer, Flash Builder
OK, Peter and Jason, now I got it.
It would be so much simpler if those bits you just gave me were included somewhere in the Help. I guess I got spoiled by FB 2 and 3.
Thank you both very much for the prompt replies.