Hello Vishal, I Understood your concern, for your specific issue you need to create style for that particular button and had to assign value at runtime of image source using converter
suited code for your concern.
http://wpfadv.blogspot.in/2010/03/image-button-control-template.html[
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You might find this process bit lengthy for your two button but if you have same thing for number of buttons then you can go with provided link way to define a style for a button.