Custom keys programing problem

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I want to make a custom key setting system,but I have a problem :

When I use a variable to store a Flash key number,it often works,except for some keys like arrow keys.

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For example :

If I set “root.ct_as1 = 37” (37 is Left arrow key)

And the statement “Key.isDown(root.ct_as1)” will be always false.

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But when I assign it to other key numbers (ex : a~z) it works fine……so do I do something wrong?

 
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works for me:

_root.mychar = 37; _root.onEnterFrame = function() { if(Key.isDown(_root.mychar)) trace("bang!"); }