ImageParameter - Can't display SubLayer from Exclusive Parent group

[GeorgieCassar]

I have a group of raster layers that are set under a group layer.  The group layer is set to "EXCLUSIVE=TRUE" so that only one raster sublayer can display at any one time.
Id's are :
Parent layer 93
Sub layers 94, 95, 96 and 97     (94 is on by default in the map service)

I want to switch the display to layer 97.

I try to do this with the following code:

imageParameters.layerIds = [29, 97];
imageParameters.layerOption = esri.layers.ImageParameters.LAYER_OPTION_INCLUDE;
var myMapLayer = new esri.layers.ArcGISDynamicMapServiceLayer "http://gsportenf/ArcGIS/rest/services/General_30/MapServer", {"imageParameters":imageParameters});
map.addLayer(myMapLayer);

After running the code above, it still displays layer 94 instead of 97.  Do I need to somehow disable the display of the parent layer or sublayer 94 before I can display layer 93 ?

ps: I tried excluding all the unwanted layers first with
imageParameters.layerIds = [93, 94, 95, 96];
imageParameters.layerOption = esri.layers.ImageParameters.LAYER_OPTION_EXCLUDE
(Made no difference.)

Hoping someone can help.

[HemingZhu]

I have a group of raster layers that are set under a group layer.  The group layer is set to "EXCLUSIVE=TRUE" so that only one raster sublayer can display at any one time.
Id's are :
Parent layer 93
Sub layers 94, 95, 96 and 97     (94 is on by default in the map service)

I want to switch the display to layer 97.

I try to do this with the following code:

imageParameters.layerIds = [29, 97];
imageParameters.layerOption = esri.layers.ImageParameters.LAYER_OPTION_INCLUDE;
var myMapLayer = new esri.layers.ArcGISDynamicMapServiceLayer "http://gsportenf/ArcGIS/rest/services/General_30/MapServer", {"imageParameters":imageParameters});
map.addLayer(myMapLayer);

After running the code above, it still displays layer 94 instead of 97.  Do I need to somehow disable the display of the parent layer or sublayer 94 before I can display layer 93 ?

ps: I tried excluding all the unwanted layers first with
imageParameters.layerIds = [93, 94, 95, 96];
imageParameters.layerOption = esri.layers.ImageParameters.LAYER_OPTION_EXCLUDE
(Made no difference.)

Hoping someone can help.

Have you tried using layerInfos. In layerInfos, you can identify sublayer by name, parentLayerId and/or subLayerIds. something like this:
var infos = myMapLayer.layerInfos;   
    //set the selected layer visible
    for (var i = 0; i < infos.length; i++) {
        if (infos.parentLayerId !=-1){   // a sublayer
            if (infos.name ==your raster layer name that you want to turn on)
             viewService.setVisibleLayers();
        {
    }
I have not testing the code. but should be something very colse...