// The Panel is not ready during ApplyTemplate of the RibbonGallerryCategory, so it should be queried at later time.
private void OnItemContainerGeneratorStatusChanged(object sender, EventArgs e)
{
if (ItemContainerGenerator.Status == GeneratorStatus.ContainersGenerated)
{
SynchronizeWithCurrentItem();
if (_itemsPresenter != null)
{
ItemsHostSite = (Panel)(ItemsPanel.FindName(RibbonGalleryCategory.ItemsHostPanelName, _itemsPresenter));
}
}
}