title: DialogFragment calls back to activity, but want activity to update another fragment
body: <p>How can I get my activity to update a fragment it controls?  It goes like this, I have a DatePickerDialog, that when your in the Fragment its called.  I have a call back to the activity to let it know when this datepickerdialog is done having a date selected that passes back the date selected.  So my activity has it, but I want the Fragment that called the DialogFragment to have access to it, instead of the activity above.  Is this possible?</p>
  
  <p>So I have this <code>EditSessionActivity</code>, that in it calls the <code>SessionEdit Fragment</code>.  Which loads the fragment with UI and a date button, when that is clicked a <code>DialogFragment</code> called <code>DatePickerDialogFragment</code> is launched, this works great, and calls back to the <code>EditSessionActivity</code> that implements the <code>OnDialogDoneListner</code> that I wrote.  The data is there, but I want to push that data back to the <code>SessionEdit</code> fragment to update its UI.  How would I go about doing this?</p>
  
  <p>Earlier today I thought I was going to easily get this to work, tried to answer something here:</p>
  
  <p><a href="https://stackoverflow.com/questions/6668619/how-to-create-datepicker-and-timepicker-dialogs-in-fragment-class/6711000#6711000">How to create datePicker and timePicker dialogs in fragment class?</a></p>
  
  <p>realizing that my UpdateDisplay (From the link above) there in the above link does zilch for updating the buttons text from the calling fragment like I want.</p>