Android :: Change Content Of Tab On Button Click

I have been reading a lot of comments on how it is more lightweight to use views instead of intents in setContent when using tabs.

Since I will be creating an app with tabs, I am trying to implement this instead of having intents inside setContent. However, I am having a difficult time looking for examples or straightforward tutorials on swapping the current view with another one.

Say I have TAB_A, with some entry fields and a button. When the user clicks on the button, a TextView will display "Hello, user!" in the same TAB_A. Of course this is an oversimplified example, but it will surely point me in the right direction.

EDIT: I have a tab called TAB_A with a button in it. If the user clicks on that button, TAB_A will now display "Hello, user!" instead of the button.

Here is a sample of my TabSpec.

CODE:..............

Where ShowButton and ShowHello are classes both extending LinearLayout. Both are initialized in onCreate like this:

CODE:.............

When the app first starts, the user sees the view showButton. When the user clicks on the button, I want the tab to change its contents to showHello.

The question then is: Is there any way to update the contents of the tabspec without using startActivity?