Silverlight InlineCollection.Add(InlineUIContainer) missing?

I'm having difficulty adding the inline of specific type InlineUIContainer into the InlineCollection (Content property) of a TextBlock. It appears the .Add() method of InlineCollection doesn't accept this type, however you can clearly set it through XAML without explicitly marking the content as a InlineContainer, as demonstrated in many examples:

http://msdn.microsoft.com/en-us/library/system.windows.documents.inlineuicontainer.aspx

Is it possible to prog开发者_StackOverflow中文版ramatically add one of these as in the following?

Target.Inlines.Add(new Run() { Text = "Test" });
Target.Inlines.Add(new InlineUIContainer() { 
Child = new Image() { Source = new BitmapImage(new Uri("http://example.com/someimage.jpg")) } });
Target.Inlines.Add(new Run() { Text = "TestEnd" });

I have a feeling what's going on is that Silverlight is using a value converter to create the runs when specified in XAML as in the example which doesn't use InlineContainer, but I'm not sure where to look to find out.

The specific error I'm getting is as follows:

Cannot add value of type 'System.Windows.Documents.InlineUIContainer' to a 'InlineCollection' in a 'System.Windows.Controls.TextBlock'.

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As pointed out by Jedidja, we need to use RichTextBox to do this in Silverlight.

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You can't Add() Runs directly, but you can add Spans containing Runs.

Interestingly, you can also do this:

textBlock.Inlines.Clear();
textBlock.Inlines.Add(new Span());
textBlock.Inlines[0] = new Run();

Not that it's a good idea to hack around what the framework is actively trying to prevent you from doing.

P.S. If you can't figure out what XAML is doing, inspect the visual tree.