public void AddNewAnswerLayer(int offset, QuizAnswerLayer answerLayer)
{
var layerViewModel = new Layer(this, lessonModel, answerLayer);
Layers.Add(new KeyValuePair <int, Layer>(offset, layerViewModel));
CurrentLayerIndex = Layers.Count - 1; // Select the last Layer (which is the Answer Layer)
CurrentLayer.DisplayChart(); // Compile Chart for the Layer
}