esriLegend, reload in code behind

Question

I'm using the esriLegend control.  I'm using LayerIDs in xaml and restricting the list.  When user clicks a radio button, I want to change the layers in legend (layers are already in map but not in legend) in code behind.  I haven't gotten very far:

case "Time Viewer":
    String[] aerialList = {"Parcels, Aerials 2002, Aerials 2005, Aerials 2009"};
    esriLegend.LayerIDs = aerialList ;

The legend goes blank.  I tried adding esriLegend.Refresh() but that didn't work.  Any thoughts?

Sincerely,
KnowsEnoughToBeDangerous

DominiqueBroux · Answer

String[] aerialList = {"Parcels, Aerials 2002, Aerials 2005, Aerials 2009"};

The mistake is there. You have to initialize your object with a list of strings, not with one string containing a list.
So the code should be : 
String[] aerialList = {"Parcels", "Aerials 2002", "Aerials 2005", "Aerials 2009"};

Note : the value converter allowing to transform a string containing a list to a list of strings is only working in XAML. The converter is not being called when you set the property by code.

PatrickBrooke · Answer

I tried your method and I am able to add and remove layers to the legend, so long as they are already included in the xaml side. I am not having the same problem using the same method you display. I did this using ESRI's legend sample and your code: private void remAddLayers() { string[] aerialList = {"Points of Interest", "United States"}; esriLegend.LayerIDs = aerialList; esriLegend.Refresh(); } Xaml: And I was able to add the United States layer.

PLadd · Answer

Here's one more thing I tried.

The original list is this:

LayerIDs="Parcels, Other Features, Buildings"

If I do this in code behind, it works OK:

String[] aerialList = {"Parcels"};
esriLegend.LayerIDs = aerialList ;
esriLegend.Refresh();

So it looks I can reduce the original list but not add to it.  Any thoughts?