Draw this GUIStyle on to the screen, internal version.
Draw plain GUIStyle without text nor image.
Draw the GUIStyle with a text string inside.
Draw the GUIStyle with an image inside. If the image is too large to fit within the content area of the style it is scaled down.
Draw the GUIStyle with text and an image inside. If the image is too large to fit within the content area of the style it is scaled down.