If your 4D Chart area is small (less than 300 pixels wide by 150 pixels high), its default behavior is to display as a large button, instead of as a 4D Chart area. When you click on this button, a 4D Chart external window opens up. This is known as 4D Chart's "button mode." To avoid this, you can either make your 4D Chart area larger, or you can suppress the button mode by setting the optional third parameter of the CT SET ENTERABLE
command to the value 1, in the setup code for your 4D Chart area.