If you want your custom components bindable properties to popup selectable values (i.e. true/false) via code completion in Flex Builder and also to show in the Properties Panel in design view, the Inspectable tag is your friend:
[Inspectable(category="General", enumeration="true,false")]
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public var isCool:Boolean;
If your like me and have been a bit slack on the metadata tags, go here to be schooled, theres lots more goodness:
http://livedocs.adobe.com/flex/3/html/help.html?content=metadata_3.html
Haven’t used design view for many years, but didnt know it added to the “code completion” popup in FB. Very cool!