Fixed bug where custom button images were not showing up until after the first window interaction (caused by initial render area for RenderableImage not being set).
Fixed bug where custom button images were not showing up until after the first window interaction (caused by initial render area for RenderableImage not being set).

OpenTechEngine/CEGUI,ruleless/CEGUI,ruleless/CEGUI,OpenTechEngine/CEGUI,ruleless/CEGUI,ruleless/CEGUI,OpenTechEngine/CEGUI,OpenTechEngine/CEGUI