private void MoveCategoryUp(IToolboxCategory category)
{
if (category == null)
{
return;
}
var items = _service.GetToolboxItemSource();
var index = items.IndexOf(x => x.Equals(category));
_service.RemoveCategory(category, false, true);
_service.InsertCategory(index - 1, category);
_toolbox.SelectedNode = category;
}