TabbedPanel, tabsVisibilityCache throws IndexOutOfBounds

With wicket extensions 1.4.3, TabbedPanel throws an IndexOutOfBounds exception on the tabsVisibilityCache array when adding more tabs after the panel is rendered.

The onBeforeRender method calls the isTabVisible method which initializes an array of booleans for visibility caching. The length of this array is the amount of tabs added at that time. When - through ajax - a new tab is added after rendering and setSelectedTab is called an exception is thrown at:
Boolean visible = tabsVisibilityCache[tabIndex];

Fix: increase the array before checking or use a List. In TabbedPanel

private boolean isTabVisible(int tabIndex)
{
if (tabsVisibilityCache == null)

{ tabsVisibilityCache = new Boolean[getTabs().size()]; }

if (tabsVisibilityCache.length < tabIndex + 1)

{ tabsVisibilityCache = Arrays.copyOf(tabsVisibilityCache, tabIndex + 1); }

if (tabsVisibilityCache.length > 0)
{
Boolean visible = tabsVisibilityCache[tabIndex];

if (visible == null)

{ visible = getTabs().get(tabIndex).isVisible(); tabsVisibilityCache[tabIndex] = visible; }

return visible;
}
else

{ return false; }

}