[Q] remap search button to APP_SWITCH not working

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http://forum.xda-developers.com – quick question, i'm on zeus 7.01 ROM, trying to modify every file in the system/usr/keylayout/, and change Key 217 (which is search button) to APP_SWITCH.. I wanted my search button to launch the recent apps window.. But after rebooting, seach button doesn't do anything.. Am I doing something wrong? or maybe the code APP_SWITCH is wrong? many thanks! (HowTos)