WizardPagePresenter Height related to previous page problem

<Window x:Class="WizardSizeProblem.WizardWindow1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:shared="http://schemas.actiprosoftware.com/winfx/xaml/shared"
    xmlns:wizard="http://schemas.actiprosoftware.com/winfx/xaml/wizard"
    Width="600" MinHeight="450" SizeToContent="Height" ResizeMode="CanResize"
    >
    
    <wizard:Wizard x:Name="wizard" WindowTitleBehavior="PageTitle" WindowTitleBaseText="Wizard QuickStart" PageSequenceType="Stack">
        <wizard:Wizard.TransitionSelector>
            <shared:MultiTransitionSelector>
                <!-- This adds a single bar wipe transition -->
                <shared:BarWipeTransition />
            </shared:MultiTransitionSelector>
        </wizard:Wizard.TransitionSelector>
        
        <wizard:WizardPage x:Name="welcomePage" PageType="Exterior"
                Caption="Welcome to the My Wizard"
                Description="Enter a description of your wizard here.">
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="*" />
                    <RowDefinition Height="Auto" />
                </Grid.RowDefinitions>

                <TextBlock Grid.Row="1" TextWrapping="Wrap">To continue, click Next.</TextBlock>
            </Grid>
        </wizard:WizardPage>
        
        <wizard:WizardPage x:Name="tablePage1" 
                Caption="Table Page One"
                Description="This is a sample interior page that represents a step in your wizard." 
                Title="Interior Page">
            <DataGrid
                VerticalAlignment="Stretch"
                ItemsSource="{Binding Path=NodesTableOne}"
                HorizontalScrollBarVisibility="Hidden" SelectionMode="Single"
                CanUserAddRows="False" CanUserDeleteRows="False"
                CanUserResizeRows="False" CanUserSortColumns="True"
                RowHeaderWidth="17" RowHeight="25" 
                SelectionUnit="Cell"
                />
        </wizard:WizardPage>

        <wizard:WizardPage x:Name="tablePage2" 
                Caption="Table Page Two"
                Description="This is a sample interior page that represents a step in your wizard." 
                Title="Interior Page">
            <DataGrid
                VerticalAlignment="Stretch"
                ItemsSource="{Binding Path=NodesTableTwo}"
                HorizontalScrollBarVisibility="Hidden" SelectionMode="Single"
                CanUserAddRows="False" CanUserDeleteRows="False"
                CanUserResizeRows="False" CanUserSortColumns="True"
                RowHeaderWidth="17" RowHeight="25" 
                SelectionUnit="Cell"
                />
        </wizard:WizardPage>

    </wizard:Wizard>
    
</Window>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace WizardSizeProblem
{
    public class WizardWindow1ViewModel
    {
        public WizardWindow1ViewModel()
        {
            for (int i = 0; i < 20; i++) {
                NodesTableOne.Add(new TestObject(i.ToString()));
            }

            for (int i = 0; i < 18; i++) {
                NodesTableTwo.Add(new TestObject(i.ToString()));
            }
        }

        private List<TestObject> nodesTableOne;
        public List<TestObject> NodesTableOne
        {
            get
            {
                if (nodesTableOne == null)
                    nodesTableOne = new List<TestObject>();
                return nodesTableOne;
            }
        }

        private List<TestObject> nodesTableTwo;
        public List<TestObject> NodesTableTwo
        {
            get
            {
                if (nodesTableTwo == null)
                    nodesTableTwo = new List<TestObject>();
                return nodesTableTwo;
            }
        }
    }

    public class TestObject {
        public TestObject(string name)
        {
            this.Name = name;
        }

        public String Name { get; set; }
    }
}