Question: I want to add different buttons, vertically stacked, to a `JPanel` at run-time and use a `JScrollPane` so that all buttons will be visible (with some scrolling).

In order to do this, I have added my `JPanel` to a `JScrollPane`, after which I add buttons to my `JPanel`.

However, when I do this the vertical scrollbar does not allow me to see all images. For example when I add 7 buttons I can only scroll to see 5 full images and half of the 6 images.

Why doesn't my scrollbar allow me to display all 7 buttons?

Answer: 
Create the panel and scrollpane like:

```
JPanel panel = new JPanel();
JScrollPane scrollPane = new JScrollPane( panel );

```

When you add buttons to the panel at run time the code should be:

```
panel.add( button );
panel.revalidate();

```

As long as you are using a layout manager the preferred size will be recalculated and the scrollbar will appear.
Make scroll pane a wrapper over your panel - `new JScrollPane (myPanel)` and add it instead of naked panel in your panel's container. 

You also may want to play with its `setPreferredSize()` method.