When you click the Painter tab to create a new form, you might find that graphical objects enclosed in a GridPanel already exist on the form.
This can occur in the following cases:
Inherited Interface − If the class for which you are creating an interface inherits from another class that contains an interface, the form objects of the parent class are added to the current form as immovable objects and cannot be modified. Instead, if an attribute inherits from a class that contains an interface, the form objects of the parent class are added to the current form as a movable GridPanel when the attribute is dragged onto the form.
Attribute Group − If the class for which you are creating an interface contains an Attribute Group. In previously released versions of the product, these were referred to as Keywords. The existing GridPanel can be moved within the form, but its contents cannot be modified or removed.