[dev] How to make R's windows floating?

Hi, I tried to make all of R[www.r-project.org] relative stuffs, like graph it
produces by graphic device x11(), floating, the method I've tried are:

    { NULL, "R", NULL, 0, True },
    { NULL, "R*", NULL, 0, True },
    { NULL, NULL, "R", 0, True },
    { NULL, NULL, "R*", 0, True },
    { "R", NULL, NULL, 0, True },
    { "R*", NULL, NULL, 0, True },

But all of them failed, what's wrong?

-- 
Hi,
Wu, Yue