Bug 109393 [Wizards] Wizard dialog doesn't react to changes properly in runnable context
bundles/org.eclipse.jface/src/org/eclipse/jface/wizard/WizardDialog.java
}
    /**
     * Creates the Cancel button for this wizard dialog.
     * Creates a standard (<code>SWT.PUSH</code>) button and registers for its
     * selection events. Note that the number of columns in the button bar composite
     * is incremented. The Cancel button is created specially to give it a 
     * removeable listener.
     *
     * @param parent the parent button bar
     * @return the new Cancel button
     */
    private Button createCancelButton(Composite parent) {
        
        ((GridLayout) parent.getLayout()).numColumns++;
        Button button = new Button(parent, SWT.PUSH);
        button.setText(IDialogConstants.CANCEL_LABEL);
        setButtonLayoutData(button);
        button.setFont(parent.getFont());
        button.setData(new Integer(IDialogConstants.CANCEL_ID));
        button.addSelectionListener(cancelListener);
        return button;
    }
    /**
     * Return the cancel button if the id is a the cancel id.
     * @param id the button id
     * @return the button corresponding to the button id
     */
    protected Button getButton(int id) {
        if (id == IDialogConstants.CANCEL_ID)
            return cancelButton;