X1,X2,Y1,Y2 Return the button region limits. FONT Return the current character font type in buttons.
SIZE Return the current character font size in buttons.
X1,X2,Y1,Y2 Set the button region limits. FONT Set the character font type in buttons. SIZE Set the character height in buttons. X1,X2,Y1,Y2 Set the plot region limits. NB Determine whether any button has been selected.