如何在Adobe Illustrator或Expression Design文件中嵌入png以创建XAML

I have an AI file. I paste it into Expression Blend and then export the XAML for use in my WPF project. Works for most of my files, but some export the XAML plus a seperate png file. What can I do so that the png is embedded into the paths of my image and not a seperate image? Can it be done?I have an AI file. I paste it into Expression B