This is a macro that I use on Hulan and Winífred a lot.  Basically, you create the macro and put it on a button.  Select your target to be cc’d and either left-click the button or press the key if it’s keybound.  This will cast your cc spell and make the target your focus.  You can now switch to any other target without losing your focus.  When you need to re-apply the cc just right-click the button and your focus will be re-sheeped/shackled without you losing your target.

#showtooltip
/cast [button:2, target=focus] Shackle Undead; Shackle Undead
/focus [nobutton:2]

Posted by Hulan on 19th January, 2008