Remove GridDateTimeColumn DateRange filter when both date pickers are blank

Hello, I'm trying to do something pretty straightforward, I'd like to remove the filter parameters from my grid results when clearing the two datepickers from the griddatetime column daterange filter. Example (From: 01/01/2015 To: 02/01/2015....results in data between that date range, If I were to clear the two datepickers, the grid does not return ALL records nor does it even do a postback like any other filter types that get cleared.

Here is my markup.