How do we set the tooltip for a palette node? Currently it defaults to the id value. I want it to use the shapeText value. The below didn't work for me.
```
private void CreatePaletteNode(string id, string shapeText, FlowShapes flowShape)
{
DiagramNodeAnnotation nodeannotation = new DiagramNodeAnnotation() { Content = shapeText, Id = id };
DiagramNode diagramNode = new DiagramNode()
{
Id = id,
PreviewSize = new SymbolSizeModel() { Width = 200, Height = 200 },
Shape = new DiagramShape() { Type = DiagramShapes.Flow, FlowShape = flowShape, TextContent = shapeText },
Annotations = new ObservableCollection() { nodeannotation },
Tooltip = new NodeTooltip { Content = shapeText }
};
FlowShapeList.Add(diagramNode);
}
```