manipulate other classes from a DialogBox

[linuxerito]

Hello good with all
good companions
I have a main class and another class DialogBox entrypoin
separated.
DialogBox from my class
I want to manipulate objects of class entrypoin

for example in my class I have a DialogBox method, by which I want to manipulate
entrypoint class objects.
Here the example:

mymetod public () {
Classentry Classentry oclassentry = new ();
oClassentry.enablebbutton ();
}

Help me with an example thanks