wpf - Problems with module dependency and eventAggregator on module load in C# prism -

i using prism c# there have problem load of 2 modules. in module tabcontrol itemtemplate , contenttemplate. module b subview of module , in contenttemplate of module a.

xaml of module a

<grid>     <tabcontrol x:name="tabcontrol" itemssource="{binding folders}" selecteditem="{binding selecteditem}" horizontalalignment="stretch"  verticalalignment="stretch">         <tabcontrol.itemtemplate>             <datatemplate>                 <textblock text="{binding name}"/>             </datatemplate>         </tabcontrol.itemtemplate>         <tabcontrol.contenttemplate>             <datatemplate>                 <contentcontrol prism:regionmanager.regionname="listmodulregion" horizontalcontentalignment="stretch" verticalcontentalignment="stretch"/>             </datatemplate>         </tabcontrol.contenttemplate>     </tabcontrol> </grid> 

viewmodel of module a

in viewmodel of module eventaggregator. publish event when other item in tabcontroll selected.

    #region private fields **************************************************************************************************      private readonly ideviceservice _deviceservice;     private readonly ieventaggregator _eventaggregator;      private modulefolder _selecteditem;     #endregion      #region public properties ***********************************************************************************************      public ienumerable<modulefolder> folders     {                 {             return _deviceservice.modulefolders;         }     }      public modulefolder selecteditem     {         { return _selecteditem; }         set         {             _selecteditem = value;             onpropertychanged(() => selecteditem);             modulefolderchangeevent evt = _eventaggregator.getevent<modulefolderchangeevent>();             evt.publish(selecteditem);         }     }     #endregion      #region constructor(s) **************************************************************************************************      public folderselectionviewmodel(ieventaggregator eventaggregator, ideviceservice deviceservice)     {         _eventaggregator = eventaggregator;          _deviceservice = deviceservice;         if(_deviceservice.modulefolders.count>0)         {             selecteditem = _deviceservice.modulefolders[0];         }     } 

viewmodel of module b

in viewmodel of module b eventaggregator subscribte event.

    #region private fields **************************************************************************************************     private modulefolder _currentfolder;     private readonly ieventaggregator _eventaggregator;     private readonly ideviceservice _deviceservice;     private readonly iuidispatcher _uidispatcher;      private observablecollection<moduleviewmodel> _observablemodules;     private moduleviewmodel _selectedlistitem;     #endregion      #region public properties ***********************************************************************************************      public observablecollection<moduleviewmodel> observablemodules     {                 {             return (_observablemodules);         }         set         {             _observablemodules = value;             onpropertychanged(() => observablemodules);         }     }      public moduleviewmodel selectedlistitem     {         { return _selectedlistitem; }         set         {             _selectedlistitem = value;             onpropertychanged(() => selectedlistitem);         }     }     #endregion      #region constructor(s) **************************************************************************************************      public modulelistviewmodel(ieventaggregator eventaggregator, iuidispatcher uidispatcher, ideviceservice deviceservice)     {         modulefolderchangeevent evt = eventaggregator.getevent<modulefolderchangeevent>();         evt.subscribe(onmailfolderchanged);          _eventaggregator = eventaggregator;         _uidispatcher = uidispatcher;         _deviceservice = deviceservice;          propertychanged += modulelistselectionviewmodel_propertychanged;     }     #endregion 

bootstrapper

in bootsrapper module depends on modul b.

    protected override void configuremodulecatalog()     {         base.configuremodulecatalog();          modulecatalog modulecatalog = (modulecatalog) modulecatalog;          //communication         type servicemodule = typeof(communicationmodule);         modulecatalog.addmodule(servicemodule);          //device list         type devicelistuimodule = typeof(devicelistmodule);         system.collections.objectmodel.collection<string> dependsdevicelistui = new system.collections.objectmodel.collection<string>         {             servicemodule.name         };          modulecatalog.addmodule(new moduleinfo         {             modulename = devicelistuimodule.name,             moduletype = devicelistuimodule.assemblyqualifiedname,             dependson = dependsdevicelistui,         });          //tap region         type selectionuimodule = typeof (selectionmodule);         system.collections.objectmodel.collection<string> dependsselectionui = new system.collections.objectmodel.collection<string>         {             servicemodule.name,             devicelistuimodule.name         };          modulecatalog.addmodule(new moduleinfo         {             modulename = selectionuimodule.name,             moduletype = selectionuimodule.assemblyqualifiedname,             dependson = dependsselectionui         });     } 

the problem

when module loaded. first item selected , publish event. module b not loaded subscribe late event miss first publish. @ second time when module b loaded every thing works fine.

i have read how control order of module initialization in prism. maybe there way or better way of doing that. because i'm new in prism , dont best way doing it.

sorry poor english. :-(

within bootstrap process ensure "moduleb" gets loaded , initialized before "modulea".