private void ArrangeContentPresenter(FrameworkElement element, ColumnDefinition contentColumn, RowDefinition contentRow)
{
element.ApplyGridPosition();
Grid.SetColumn(element, ItemsHost.ColumnDefinitions.IndexOf(contentColumn));
Grid.SetRow(element, ItemsHost.RowDefinitions.IndexOf(contentRow));
if (ReferenceEquals(element, ContentPresenter))
{
_childrenDefinitions[element] = new UIChildDefinition(contentColumn, contentRow);
}
}