/// <summary>
/// If elements are declared, but have no graphics, we won't try to render them.
/// </summary>
void RemoveUnrenderableElements(JwSkinPackage pkg)
{
for (var i = 0; i < elements.Count; i++) {
if (elements[i].Type != ControlBarElement.ElementType.Button) continue;
if (pkg.HasNamedElement("controlbar", elements[i].ElementName())) continue;
elements.RemoveAt(i);
i--;
}
}
