Share 'Transparent (png) icons in custom grasshopper component'

Hello, I am attempting to create a transparent icon for a custom grasshopper component built in SharpDevelop. We have succesfully added icons as a resource to the project and return the icon as a property override. However, the file comes in as a bitmap even though we save it as a .png file.  Does anyone know the process to create a transparent icon, so that the whitespace of our icon becomes t…