I embedded RelativeLayout in a LinearLayout, but can't see widgets in LinearLayout

This is the XML Code. The problem is that I can't see the textView tvDisplayName, although I don't get any errors. Why is this?
Thanks for your help?

Code:

---


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/llLinear"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:padding="5dp">
   
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:padding="5dp"
    android:id="@+id/rlRel">
    <TextView
        android:id="@+id/tvName"
        android:text="Name:"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="10dp"/>
    <EditText
        android:id="@+id/etName"
        android:text="Enter Name Here"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@id/tvName"
        android:layout_alignBaseline="@id/tvName">
        </EditText>
        <Button
            android:id="@+id/btnOK"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Okay"
            android:layout_below="@id/etName"
            android:layout_alignRight="@id/etName">
           
        </Button>
    <Button
        android:id="@+id/btnCancel"
        android:text="Cancel"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toLeftOf="@id/btnOK"
        android:layout_alignBottom="@id/btnOK"/>
 
     
</RelativeLayout>

      <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/tvDisplayName"
            android:text="Test">
      </TextView>   
   
</LinearLayout>

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XML is correct but maybe you have a problem with Relative Layout Height =wrap content

Has your device screen enough space to show Relative Layout Compnents + TextView?