Answer by Sinatr for Images Layout in FlowDocument

You need to put multiple images into same BlockUIContainer, using WrapPanel as its child.

Here is xaml to demonstrate, converting it to code-behind should be fairly straightforward, you will need to keep WrapPanel instance somehow:

<FlowDocument><BlockUIContainer><WrapPanel><TextBlock>Image 1</TextBlock><TextBlock>Image 2</TextBlock></WrapPanel></BlockUIContainer></FlowDocument>