I've searched around on this now and again, and I can't find a way so far.
I've a custom marking menu set up for UV tasks, and have it assigned to a hotkey. However, this combination isn't valid within the UV editor window, only in the viewport, or if the texture editor is part of the viewport, but I don't work that way.
In looking a the commands Maya set up when the hotkey assignment was made, I see "-parent viewpanes" as an argument. Does anyone know what the UV Editor window might be called?
edit: I've tried 'textureWindow', but that's a no-go.
edit2: polyTexturePlacementPanel1 is, however. (found a simple query script in the docs to get the current name)