I tried to manipulate the position of the buttons using the x,y of button function in the main panel early on as per the manual. It doesn't work. So I have to use the panel position (x_pos,y_pos) of the individual button in order to move them. Moreover, if I try to use other than 0,0 for the button function x,y - the button will cease to function. Thus, the button function appears to control only the function and not the position of the button and I can only use one button in the main panel.