Changed the postion of context menu to avaliable space

Changed the postion of context menu to avaliable space

[Title] Changed the display location of context menu in avaliable space
[Issue#] P130623-0376, P130619-0477
[Problem] Context menu is not visible fully when there is space
    on the screen
[Cause] Context menu is having style to create menu on top direction.
    So always the direction was top and the context menu was made scrollable
    and was displayed at the end
[Solution] Added mutliple direction. Now context menu will be open in
    the avaliable space

Change-Id: Id2515e94f15edd21cb4062804e43734743f4adbe