moveTaskToBack(true) returns false always

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http://stackoverflow.com – I know this has been asked earlier here & here too.They are not answered properly (or not answered at all).But,i don't know why moveTaskToBack(true); always returns false for me .Can anyone tell me why and how could i solve the issue? Thanks in advance. public void onBackPressed() { boolean r= moveTaskToBack(true); //r is false !! using API LEVEL 8 } Note:The activity from which i am calling it is a child Activity included in a tabActivity and neither of this is a MAIN or LAUNCHER activity.I don't know if that makes a difference. EDIT: and as a result the application do (HowTos)