Due to background-image being marked !important in the media section of re-com.css, all attempts to style this control via stylesheets with a custom image for the dropdown arrow are failing. I had to resort to the following 'deep hacking' in componentDidMount to achieve the styling.

(.setProperty (aget b "style") "background-image" "image.png" "important")

where b is defined as:

(.item (.getElementsByTagName (.getDOMNode this) "b") 0)

This poking into the implementation of the dropdown to pull out a b is obviously not ideal.

See Issue #99 for similar situation.