Adding a menu item to a FlowDocumentReader ContextMenu - wpf

Question

The FlowDocumentReader has two menu items in its ContextMenu, Copy and Select All. I'd like to add an additional MenuItem to it and have tried this:
private void FlowDocumentReader_ContextMenuOpening(object sender, ContextMenuEventArgs e)
{
flowDocumentReader.ContextMenu.Items.Clear();
MenuItem menuItem = new MenuItem();
menuItem.Header = "Test";
flowDocumentReader.ContextMenu.Items.Add(menuItem);
}
additionally I've tried this:
private void FlowDocumentReader_ContextMenuOpening(object sender, ContextMenuEventArgs e)
{
MenuItem menuItem = new MenuItem();
menuItem.Header = "Test";
flowDocumentReader.ContextMenu.Items.Add(menuItem);
}
where I don't clear the items in the context menu and attempt to append it. Neither of these work.
I can create my own menu like so:
private void FlowDocumentReader_ContextMenuOpening(object sender, ContextMenuEventArgs e)
{
MenuItem menuItem = new MenuItem();
menuItem.Header = "Test";
flowDocumentReader.ContextMenu.Items.Add(menuItem);
e.Handled = true;
ContextMenu menu = new ContextMenu();
MenuItem a = new MenuItem();
a.Header = "A";
menu.Items.Add(a);
MenuItem b = new MenuItem();
b.Header = "B";
menu.Items.Add(b);
flowDocumentReader.ContextMenu.Items.Clear();
flowDocumentReader.ContextMenu = menu;
menu.IsOpen = true;
}
And that'll show up, but what I'd like to have is the Copy and Select All menu items as well as A and B.
Ideas?

Answer 1

You could also do this in the xaml for the FlowDocument:
<FlowDocument.ContextMenu>
<ContextMenu>
<MenuItem Header="{Resx Copy}" Command="Copy"/>
<MenuItem Header="{Resx SelectAll}" Command="SelectAll"/>
<MenuItem Header="{Resx CustomCommand}" Command="{Binding CustomCommand}"/>
</ContextMenu>
</FlowDocument.ContextMenu>
(Headers conveniently localized thanks to Grant Frisken's Resx Extension) :)
If this needs to be applied to many FlowDocuments, you could also define it in a default style somewhere:
<Style TargetType="FlowDocument">
<Setter Property="ContextMenu">
<Setter.Value>
<ContextMenu>
<MenuItem Header="{Resx Copy}" Command="Copy"/>
<MenuItem Header="{Resx SelectAll}" Command="SelectAll"/>
<MenuItem Header="{Resx CustomCommand}" Command="{Binding CustomCommand}"/>
</ContextMenu>
</Setter.Value>
</Setter>
</Style>

Answer 2

The solution I arrived at was to simply recreate those MenuItems on the new Menu and cancel the display of the built-in ContextMenu that is normally displayed. There are a number of built-in ApplicationCommands which can be incorporated into your own custom ContextMenu and the implementation of this is quite straightforward.
Assume that I've got a ContextMenu created from some method, GetContextMenu(), the following event handler rejects the opening of the built-in ContextMenu and substitutes the one returned from the call to GetContextMenu() and adds in the Copy command (Select All is similar).
private void flowDocumentReader_ContextMenuOpening(object sender, ContextMenuEventArgs e)
{
e.Handled = true; // keeps the built-in one from opening
ContextMenu myMenu = GetContextMenu();
MenuItem copyMenuItem = new MenuItem();
copyMenuItem.Command = ApplicationCommand.Copy;
copyMenuItem.CommandTarget = myFlowDocument;
myMenu.Items.Add(copyMenuItem);
ShowMenu(myMenu);
}
private void ShowMenu(ContextMenu menu)
{
menu.Placement = PlacementMode.MousePoint;
menu.PlacementRectangle = new Rect(0.0, 0.0, 0.0, 0.0);
menu.IsOpen = true;
}