swing component inheritance in Visual Editor of Eclipse

[alex_us01]

hello,

I am using Eclipse with Visual Editor.
I have a JDialog that I want to use as a base class and several classes
will extend (sub-class) this JDialog.
Since all of them contain some other custom component that I have
created,
I put that custom component on the base class.

When I create a visual class for a subclass, the base class components
are not shown.
Am I missing a step or does VE not support it?
How can I do it?
I want to add additional different components to each subclass and keep
the common component from superclass (i.e. base class).

thanks,
alex