Custom Filters similar to existing drop down Time Filter

[Hari3045]

Hi,
I am trying to create filters with default values similar to the existing time filter in header. I went through the code and found that this function is taken care in panels/timepicker/modules.js. I am unable to figure our how change in $scope.filterSrv value is applied to all other panels in the dash board.
On figuring this out, I am planning to add a drop down filter for another field, say a gender field with male and female option and have the choice made here impact all panels.
Help is much appreciated. Thanks.