@JCL: Changing the position of a panel *after* it has been created is easy. I would like to define its position using a variable at the time the panel is CREATED. The main purpose is the one I described above - changing screen resolutions can not cause the panels to change their position if the pos_x and pos_y are defined "screen relative".
And what about the window-element and its dx and dy parameters? I can't imagine a function which is capable of changing these two values...