private void ReplaceFragment()
{
GoalListFragment goalListFragment = new GoalListFragment();
FragmentTransaction fragmentTx = this.FragmentManager.BeginTransaction();
fragmentTx.Replace(Resource.Id.frame_container, goalListFragment).Commit();
}
//button.Text = date.ToString ("d");
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.Main);
// Show fragment on create
GoalListFragment goalListFragment = new GoalListFragment();
FragmentTransaction fragmentTransaction = this.FragmentManager.BeginTransaction();
fragmentTransaction.Replace(Resource.Id.frame_container, goalListFragment).Commit();
// Date Picker
pickDate = FindViewById <Button> (Resource.Id.date_picker_btn);
// add a click event handler to the button
pickDate.Click += delegate { ShowDialog(DATE_DIALOG_ID); };
// get the current date
date = DateTime.Today;
// display the current date (this method is below)
UpdateDisplay();
// updates the date in the TextView
}