MonodroidStockPortfolio/MonoStockPortfolio/Resources/layout/portfolio.axml

<?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:id="@+id/btnAddPosition"
            android:text="Add Position"
            android:layout_height="wrap_content"
            android:layout_width="fill_parent" />

    <LinearLayout android:id="@+id/quoteHeaderLayout"
                    android:layout_height="wrap_content"
                    android:layout_width="fill_parent"
                    android:orientation="horizontal" />

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

</LinearLayout>