Opaque subwindow graph ?

Is there an easy way of creating an opaque subwindow graph with a white background ? There must be one but the only way I've found of doing it is to make the window/graph background very, very slightly off-white. It seems like for some reason white is automatically transparent.

Chris
Yes, pure white, (65535,65535,65536) in Igor rgb, is taken to be transparent.

Since only the high 8 bits have any effect on the screen or export, you can use something like (65500,65500,6550).