RelativeLayout align Textview and Edittext

Question

I want to use a RelativeLayout to align horizontally a textview and after that an edittext and then again a textview and then an edittext. I know that you can do that with a LinearLayout, but I want to accomplish that with a relativeLayout. My Code is the following:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/userNameLbl"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Username:"
        android:layout_alignParentLeft="true" />
    <EditText
        android:id="@+id/userNameText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@+id/userNameLbl"
        android:minWidth="200dp"
        android:text="Sample Text" />
    <TextView
        android:id="@+id/pwdLbl"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Password:"
        android:layout_toRightOf="@+id/userNameText"
        android:layout_toEndOf="@+id/userNameText" />
    <EditText
        android:id="@+id/userNameText2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@+id/pwdLbl"
        android:minWidth="200dp"
        android:text="Sample Text" />
 </RelativeLayout>

But it doesn't work. All the controls (edittexts and textviews) are put on each other! What is wrong with my code? I have used layout_toRightOf to put them next to each other. And because it was mentioned, there is enough place for the controls. Here is also a picture of the designer, how it is looking like:

Answer 1

Ok, the problem seems to be in Xamarin Studio itself which is not rendering the content of the layout correctly. Because when I run this layout on a device the controllers are put next to each other and there is not such a problem, but the designer show it completely different.