How to bind Modifier (Shift/Alt/Ctl+Left click/Right click?

I've tried several times to bind macros/spells on ****+left/right click, however, it does not work. Can someone please tell me if it's possible or you need an add-on?

Quote:

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#showtooltip
/cast [nomod] Spell Name
/cast [mod:shift] Another Spell Name

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or

Quote:

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#showtooltip
/cast [mod:shift] Another Spell Name; Spell Name

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Also, you can include more than one modifier in a single macro:

Quote:

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#showtooltip
/cast [nomod] Spell One
/cast [mod:shift] Spell Two
/cast [mod:ctrl] Spell Three
/cast [mod:alt] Spell Four

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