Involuntary actions are not under our control right? Then how come hypothalamus controls involuntary actions ??

dear sushmitha 
no , hypothalmus doesnot controll involuntary actions like breathing , instead it controll body temperature , hunger , thirst and sleep and provide a link between nervous and endocrine system . 
and these actions are not under your controll , right ?? 
and medulla oblongata controlls involuntary actions such as breathing , blood pressure and heart beat . and its a part of brain stem . 
HOPE IT CLEARS NOW 
REGARDS