Vista - ListBox ItemTemplate Wrapping and others

Hi all, I have the following troubles with my first xaml application and I
would welcome any advices on them....

I have a xml with items like:
<items>
<SectionID>29</SectionID>
<Title>Mezinárodní grant AVMEDIA-SMARTBOARD</Title>
<Preamble>
very long line of text
next line of text


</Preamble>
<Time>2005-01-16 16:23:52</Time>
</items>

and I'm populating the ListBox using:

<ListBox Name="ObjectList" ItemsSource="{Binding Source={StaticResource
xmlItems}, XPath=/VeskoleOffline/items}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBlock>
<TextBlock Text="{Binding XPath=Title}" FontWeight="Bold"></TextBlock>
<TextBlock Text="{Binding XPath=ModifiedTime}" Foreground="Blue"
FontStyle="Italic" TextAlignment="Right"></TextBlock>
</TextBlock>
<TextBlock Text="{Binding XPath=Preamble}" Foreground="Gray"
Padding="16,0,0,8" TextWrapping="Wrap"></TextBlock>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>

Now, the problems:
UI:
1) The ModifiedTime is not at the right side.
2) The Preamble is not wrapped. There is a long long line and the listbox
have a horizontal scrollbar
I believe these are because of my bad design. How should I work within the
DataTemplate? How to wrap the text at the width of the listbox?

3) How should I parse the ModifiedTime value and display formated output of
DateTime? Can it be done in XAML?

Data:
4) The contents of Preamble is as it is in xml source with whitespace, that
means in this case with the last two empty rows. How should I tell the
XmlDataProvider (or the text container) to ignore WhiteSpace?
5) How can I modify the ListBox.ItemsSource XPath?
The simpler case: I have a TreeView populated from another xml document
with section names. I want the ListBox to display only the items with
SectionID={the one selected in the treeview}. I believe this could be done
in XAML, couldn't it? - on treeview selected node changed.
The worse case: I have a text box for searching, so on text change, I
would like to update the XPath to something like
/VeskoleOffline/items/Title[contains(.,'{textbox text}')]. I'm afraid this
is not possible in XAML, right? But in code I don't know how to access the
XPath property...

And the last thing, If I would like to highlight the search pattern like
in Outlook 2007, or... to detect and make http or e-mail address active...
any idea? In HTML, I would use regular expressions to enclose the match in
appropriate tag.

Many thanks for any little help or idea,
Jan