MonodroidStockPortfolio/MonoStockPortfolio/Resources/layout/main.xml

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

    <Button android:text="Add New Portfolio" android:layout_height="wrap_content"
        android:layout_width="fill_parent" android:id="@+id/btnAddPortfolio" />

    <ListView android:id="@+id/portfolioList"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content" />

</LinearLayout>