The -container option is not fully implemented on Windows at present. The only functionally complete implementation is on X
You can use the `-use` option as long as the supplied window ID identifies a window that is not managed by Tk. This is known to
work on both Unix and Windows. The Mac implementation is not, as far as I know, able to handle this in the general case; we did
something special (a hack :) for the Tcl plugin on the Mac.
I cannot say when things will get better on this front. It`s on our todo list and will percolate upwards according to demand etc etc..