Good Day All

i have a Navigation Drawer which is defined like this

Code:
 <FrameLayout
                android:id="@+id/content_frame"
                android:layout_width="match_parent"
                android:background="#0099ff"
                android:layout_height="fill_parent" />
and when one of my drawer item is selected i have this code
Code:
 // Create a new fragment and a transaction.
                        FragmentTransaction fragmentTx = this.FragmentManager.BeginTransaction();
                        Fragment1 aDifferentDetailsFrag = new Fragment1(); 
                        // The fragment will have the ID of Resource.Id.fragment_container.
                        fragmentTx.Add(Resource.Id.content_frame, aDifferentDetailsFrag);

                        // Commit the transaction.
                        fragmentTx.Commit();
                        Toast.MakeText(this, "Home:", ToastLength.Long).Show();
and Fragment1 is defined like this

Code:
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:local="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
     
    android:paddingLeft="12dp"
            android:paddingRight="12dp">
 
        <Button
            android:textSize="24dp"
            android:textColor="#FFF"
            android:id="@+id/btn_details_file_save"
            android:layout_width="match_parent" 
            android:layout_height="wrap_content"
            android:text="HOME" />
 
</ScrollView>
and the cs is defined like this

Code:
 public class Fragment1 :  Fragment
    {
          
        public override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);

            // Create your fragment here
        }
        public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        {
            return inflater.Inflate(Resource.Layout.Fragment1, null, false); 
        }
    }
when i run this , i only get a toast message, the Fragment1 does not show which has a button that is having text "home"

Thanks