Bug 63159 [Progress] Progress dialog "Run in Background" button does not resize with larger font
If you set the dialog font to something large, the "Run in background" button does not correctly resize.
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/Dialog.java
* Returns the button created by the method <code>createButton</code> for
	 * the specified ID as defined on <code>IDialogConstants</code>. If
	 * <code>createButton</code> was never called with this ID, or if
	 * <code>createButton</code> is overridden, this method will return
	 * <code>null</code>.
	 * 
	 * @param id the id of the button to look for
	 * 
	 * @return the button for the ID or <code>null</code>
	 * 
	 * @see #createButton(Composite, int, String, boolean)
	 * @since 2.0
	 */
	protected Button getButton(int id) {
		return (Button) buttons.get(new Integer(id));
	}
	/**
	 * Returns the button bar control.
	 * <p>
	 * Clients may call this framework method, but should not override it.
	 * </p>
	 * 
	 * @return the button bar, or <code>null</code> if the button bar has not
	 *         been created yet
	 */
	protected Control getButtonBar() {
		return buttonBar;
	}
	/**
	 * Returns the button created when <code>createButton</code> is called