public DiagramItem()
{
_name = String.Empty;
_nameSpace = String.Empty;
_minOccurrence = -1;
_maxOccurrence = -1;
_location = new Point(0, 0);
_childExpandButtonSize = 10;
_depth = 0;
_elementBox = Rectangle.Empty;
_documentationBox = Rectangle.Empty;
_childExpandButtonBox = Rectangle.Empty;
_boundingBox = Rectangle.Empty;
_documentationMinWidth = 100;
_size = new Size(50, 25);
_margin = new Size(10, 5);
_padding = new Size(10, 15);
_itemType = DiagramItemType.element;
_childElements = new List<DiagramItem>();
}