[flexcoders] TabNavigator : Is there a way to set corner Radius to only bottom corners?

[thebeginnersmind]

Is there a way to set cornerRadius of Tab Navigator to only bottom left and 
bottom right 
corners ( and not 4 of them)  ?

 (The below code in css sets cornerRadius to all 4 corners.)

TabNavigator {

cornerRadius: 10;

}

Thanks!!