Align button IUP

Question

I am trying to right align a button.

So far I have this:

#include <iup.h>
#include <stdlib.h>

int close(Ihandle *self) {
    return IUP_CLOSE;
}

int main(int argc, char **argv) {

    Ihandle *button, *quit, *dlg;

    IupOpen(&argc, &argv);

    button = IupButton(NULL, NULL);

    IupSetAttribute(button, "IMAGE", "extras/view.bmp");
    IupSetAttribute(button, "IMAGEPOSITION", "LEFT");

    quit = IupButton(NULL, NULL);
    IupSetAttribute(quit, "IMAGE", "extras/close.bmp");
    IupSetAttribute(quit, "IMAGEPOSITION", "RIGHT");

    IupSetCallback(quit, "ACTION", (Icallback)close);

    dlg = IupDialog(IupVbox(button, quit, NULL));

    IupShow(dlg);
    IupMainLoop();  
    IupClose();

    return EXIT_SUCCESS;
}

But the button does not align to the right.

I have tried the following:

IupSetAttribute(quit, "IMAGEPOSITION", "RIGHT"); and IupSetAttribute(quit, "ALIGNMENT", "ARIGHT"); but the button does not go to the right.

I could set SCREENPOSITON, but I am worried that might not work if run on different size sceens. How do I align my button to the right?

Here is a picture of what I have currantly with where I am aming for the button to end up: