private void AttachLayersHandler(LayerCollection layers)
{
if (layers != null)
{
layers.CollectionChanged += Layers_CollectionChanged;
// if one layer is not initialized, subscribe to Layers_Initialize event in order to update attribution items
// This update is only useful to avoid blank lines (for any reason, a TextBlock with a null string has a null height the first time and a non null height after setting again the text value to null)
if (!layers.All(layer => layer.IsInitialized))
layers.LayersInitialized += Layers_LayersInitialized;
foreach (Layer layer in layers)
AttachLayerHandler(layer);
}
}