Code

static private ElementTemplate[] s_TextAreaCenterTemplate = new ElementTemplate[] {
    new LineTemplate(0, 0, 100, 0),
    new LineTemplate(100, 0, 100, 100),
    new LineTemplate(100, 100, 100, 0),
    new LineTemplate(100, 0, 0, 0)};

static private ElementTemplate[] s_IncompletePlaceHolderTemplate = new ElementTemplate[] {
    new LineTemplate(100, 0, 0, 0),
    new LineTemplate(0, 0, 0, 100),
    new LineTemplate(0,100, 100, 100)};

static private MindFusion.Diagramming.Wpf.Shape s_IncompletePlaceHolderShape = new MindFusion.Diagramming.Wpf.Shape
    (s_IncompletePlaceHolderTemplate,
    null, // no decorations
    s_TextAreaCenterTemplate,
    FillRule.Nonzero,
    "TextCenter");