wp7 listbox bouncing - items at bottom of list - silverlight

Question

I've noticed that the last items in my list box don't scroll up freely. They almost "bounce" when I try to move them up. The effect is even worse when I have the SIP active. I can't scroll the bottom items up the screen. They stay on the bottom of the screen and I can't see them (or they are partially blocked).
Any ideas on how to correct this situation?
<ListBox VerticalAlignment="Top">
<Grid>
<TextBox Height="72" Margin="109,10,0,0" HorizontalAlignment="Left" Name="txt1" Text="" VerticalAlignment="Top" TextWrapping="Wrap" Width="341" InputScope="Text"/>
<TextBox Height="72" Margin="109,70,267,0" HorizontalAlignment="Left" Name="txt2" Text="0" VerticalAlignment="Top" Width="80" InputScope="Number" />
<TextBox Height="72" Margin="0,70,73,0" HorizontalAlignment="Right" Name="txt3" Text="0" VerticalAlignment="Top" Width="80" InputScope="Number"/>
<TextBox Height="131" Margin="12,160,0,0" HorizontalAlignment="Left" Name="txt4" Text="" VerticalAlignment="Top" TextWrapping="Wrap" Width="438" InputScope="Text"/>
<TextBox Height="72" Margin="12,320,0,147" HorizontalAlignment="Left" Name="txt5" Text="" VerticalAlignment="Top" Width="438" InputScope="Text"/>
<TextBlock Height="30" Margin="47,30,333,0" Name="lbl1" Text="Dosage" VerticalAlignment="Top" />
<TextBlock Height="30" Margin="10,90,332,0" Name="lbl2" Text="Quantity" VerticalAlignment="Top" />
<TextBlock Height="30" Margin="0,90,142,0" Name="lbl3" Text="Refills" VerticalAlignment="Top" HorizontalAlignment="Right"/>
<TextBlock Height="37" Margin="24,135,212,0" Name="lbl4" Text="Additional Instructions" VerticalAlignment="Top" />
<TextBlock Height="30" Margin="24,293,0,0" Name="lbl5" Text="Reason for Taking" HorizontalAlignment="Left" VerticalAlignment="Top" />
<TextBlock Height="30" Margin="24,385,0,0" Name="lbl6" Text="Consumption Frequency:" HorizontalAlignment="Left" VerticalAlignment="Top"/>
<TextBlock FontWeight="Bold" Height="30" HorizontalAlignment="Left" Margin="27,417,0,0" Name="lblday1" Text="Sun" VerticalAlignment="Top" Width="37" />
<TextBlock FontWeight="Bold" Height="30" HorizontalAlignment="Left" Margin="83,417,0,0" Name="lblday2" Text="Mon" VerticalAlignment="Top" Width="46" />
<TextBlock FontWeight="Bold" Height="30" HorizontalAlignment="Right" Margin="0,417,272,0" Name="lblday3" Text="Tue" VerticalAlignment="Top" Width="37" />
<TextBlock FontWeight="Bold" Height="30" HorizontalAlignment="Left" Margin="203,417,0,0" Name="lblday4" Text="Wed" VerticalAlignment="Top" Width="46" />
<TextBlock FontWeight="Bold" Height="30" HorizontalAlignment="Left" Margin="263,417,0,0" Name="lblday5" Text="Thur" VerticalAlignment="Top" Width="46" />
<TextBlock FontWeight="Bold" Height="30" HorizontalAlignment="Left" Margin="329,417,0,0" Name="lblday6" Text="Fri" VerticalAlignment="Top" Width="37" />
<TextBlock FontWeight="Bold" Height="30" HorizontalAlignment="Left" Margin="388,417,0,0" Name="lblday7" Text="Sat" VerticalAlignment="Top" Width="37" />
<CheckBox Content="CheckBox" Height="72" HorizontalAlignment="Left" Margin="15,431,0,0" Name="chkSun" VerticalAlignment="Top" VerticalContentAlignment="Top" Width="59" />
<CheckBox Content="CheckBox" Height="72" HorizontalAlignment="Left" Margin="75,431,0,0" Name="chkMon" VerticalAlignment="Top" VerticalContentAlignment="Top" Width="59" />
<CheckBox Content="CheckBox" Height="72" HorizontalAlignment="Left" Margin="135,431,0,0" Name="chkTue" VerticalAlignment="Top" VerticalContentAlignment="Top" Width="59" />
<CheckBox Content="CheckBox" Height="72" HorizontalAlignment="Right" Margin="0,431,202,0" Name="chkWed" VerticalAlignment="Top" VerticalContentAlignment="Top" Width="59" />
<CheckBox Content="CheckBox" Height="72" HorizontalAlignment="Left" Margin="255,431,0,0" Name="chkThu" VerticalAlignment="Top" VerticalContentAlignment="Top" Width="59" />
<CheckBox Content="CheckBox" Height="72" HorizontalAlignment="Left" Margin="315,431,0,0" Name="chkFri" VerticalAlignment="Top" VerticalContentAlignment="Top" Width="59" />
<CheckBox Content="CheckBox" Height="72" HorizontalAlignment="Left" Margin="375,431,0,0" Name="chkSat" VerticalAlignment="Top" VerticalContentAlignment="Top" Width="59" />
</Grid>
</ListBox>
UPDATE:
OK, I sort of answered my own question. At least I found an initial answer to my own question. What I did to correct the bouncing is to modify the height property in the .
<Grid Height="800">
Now when the SIP is active the bottom items are visible with plenty of room to spare.
As I said above, I found an answer. I don't know if it was the right answer. If you have a better way, please let me know.
When I was testing this, yes, when the SIP is active I can initially move freely to the bottom. However, when I move try to move back up I get the bounce effect again. Is there something that I need to add to allow it to move freely up and down?

Answer 1

The problem in general is that the Listbox doesn't know how tall it is. You can solve it by setting an explicit height on it's parent, sure. A better way to do it would be to define a row for it in the grid:
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<ListBox Grid.Row="0">
...
</ListBox>
</Grid>
The Height="*" says the row should take the entire space of it's container.

Answer 2

OK, I answered my own question. At least I found an answer to my own question. What I did to correct the bouncing is to modify the height property in the .
<Grid Height="800">
Now when the SIP is active the bottom items are visible with plenty of room to spare.
As I said above, I found an answer. I don't know if it was the right answer. If you have a better way, please let me know.