Googling for snippets functionality in Flex IDE and I stumbled upon this blog entry based on Europa (Eclipse 3.3.x).

http://nwebb.co.uk/blog/?p=178

Snippets come in handy for repetitive tasks like commented section headers.

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// Properties //
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// Methods //
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I am running Ganymede (Eclipse 3.4.x) and this is how I got Web Standard Tools up and running

1) Help -> Software Updates

2) Ganymede -> Web and Java EE Development

3) Put checkmark in Web Developer Tools and hit Install

4) After install it will prompt for restart, restart it

5) Window -> Show View -> Other

6) In the quick filter, type “Snip…”; Select Snippets and hit OK! The snipppets panel should now be seen;

7) Snippets are stored in “Snippet Items” which are aggregated by “Snippet Categories”. To create your first category, right click on the snippet panel and click on Customize.

8 ) In the top left corner, hit the “New” button and create a new category

9) With your new category selected, hit the “New Item”