Databinding lost when printing data-bound FlowDocument - wpf

Question

I'm losing data-bind when initiating a printing process, is that possible ? Thats what I can only think of in my situation here, where I have a Table inside a control that makes the Table data-bindable, all inside a FlowDocument. When running it the data-bind works fine and the table draws itself with some data on it with no problems.
However, when printing the output of that control is always blank.
I've added a ListView with the same bindings and when printing the generated data it too appears lost.
XAML:
<Window x:Class="GlassStore.InitBill"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:GlassStore.ViewModels"
xmlns:flowdocs="clr-namespace:FlowDocuments;assembly=FlowDocument"
Title="InitBill" Height="825" Width="1004">
<Window.DataContext>
<local:InitBillViewModel/>
</Window.DataContext>
<Grid Background="White">
<FlowDocumentReader HorizontalAlignment="Center"
HorizontalContentAlignment="Center">
<FlowDocument ColumnWidth="999999"
IsColumnWidthFlexible="True"
TextAlignment="Center"
Name="FD">
<Paragraph>
<ListView ItemsSource="{Binding GridTrans}">
<ListView.View>
<GridView>
<GridViewColumn Header="ffff"
DisplayMemberBinding="{Binding CarModel}" />
<GridViewColumn Header="xxxx"
DisplayMemberBinding="{Binding CarName}" />
</GridView>
</ListView.View>
</ListView>
</Paragraph>
<Paragraph TextAlignment="Center">
<TextBlock Text="{Binding test}" />
</Paragraph>
<flowdocs:ItemsContent ItemsSource="{Binding GridTrans}"
Background="#FFF2C3C3"
BorderThickness="2">
<flowdocs:ItemsContent.ItemTemplate>
<DataTemplate>
<flowdocs:Fragment>
<Table>
<TableRowGroup flowdocs:Attached.IsItemsHost="True">
<TableRow Background="AliceBlue" >
<TableCell Foreground="Red">
<Paragraph>
<flowdocs:BindableRun BoundText="{Binding CarName}" />
</Paragraph>
</TableCell>
<TableCell Foreground="Green">
<Paragraph>
<flowdocs:BindableRun BoundText="{Binding CarModel}" />
</Paragraph>
</TableCell>
<TableCell Foreground="Yellow">
<Paragraph>
<flowdocs:BindableRun BoundText="{Binding glassPrice}" />
</Paragraph>
</TableCell>
</TableRow>
</TableRowGroup>
</Table>
</flowdocs:Fragment>
</DataTemplate>
</flowdocs:ItemsContent.ItemTemplate>
</flowdocs:ItemsContent>
<Table>
<TableRowGroup>
<TableRow>
<TableCell>
<Paragraph>Row1 Cell1</Paragraph>
</TableCell>
<TableCell>
<Paragraph>Row2 Cell2</Paragraph>
</TableCell>
</TableRow>
</TableRowGroup>
</Table>
</FlowDocument>
</FlowDocumentReader>
<Button Command="{Binding print}"
Content="إطـبع"
Height="29" Margin="91,0,112,41"
Name="button1"
VerticalAlignment="Bottom" />
</Grid>
</Window>
Now I know the problem is not with the Custom Control, because I have the same problem now with ListView.
I've attached the source to the Window version here and the printed version here.

Answer 1

The ViewModel would be nice, especially the method behind the print command. My guess ist, that the flowdocument is put into a special print context and loses the datacontext of the window.
Try removing
<Window.DataContext>
<local:InitBillViewModel/>
</Window.DataContext>
and use
<FlowDocumentReader HorizontalAlignment="Center" HorizontalContentAlignment="Center">
<FlowDocumentReader.DataContext>
<local:InitBillViewModel/>
</FlowDocumentReader.DataContext>
...
instead. Maybe that helps?
Edit: The print command would have to move to another ViewModel to still work, of course. This other ViewModel would stay where the old one was, in the Window.DataContext.

Answer 2

Here's my solution:
define the document in a separate XAML file:
Load the Flow Document from Resource Dictionary Xaml
then print:
var prntDlg = new PrintDialog();
var res = Application.LoadComponent(new Uri("/Resources/ReportDocument.xaml", UriKind.RelativeOrAbsolute)) as ResourceDictionary;
var doc = res["ReportFlowDoc"] as FlowDocument;
doc.DataContext = this.fdswReport.Document.DataContext; //your FlowDocumentScrollViewer
doc.PageWidth = prntDlg.PrintableAreaWidth;
doc.PageHeight = prntDlg.PrintableAreaHeight;
doc.ColumnWidth = prntDlg.PrintableAreaWidth;
doc.PagePadding = new Thickness(80);
doc.IsOptimalParagraphEnabled = true;
doc.IsHyphenationEnabled = true;
if (prntDlg.ShowDialog() == true)
prntDlg.PrintDocument(((IDocumentPaginatorSource)doc).DocumentPaginator, "Report");