Link / Unlink Actions Unavailable from List View Managed by Dialog Controller

Hello Mick,

These actions belong to the Link Action Container that does not exist in the popup window template by default. You can place them to another container dynamically using the ActionControlsSiteController.CustomizeActionControl event:

C#
using DevExpress.ExpressApp;  
using DevExpress.ExpressApp.Actions;  
using DevExpress.ExpressApp.SystemModule;  

namespace LinkUnlinkExample.Module.Controllers {  
    public class LinkSkillsController : ViewController {  
        public LinkSkillsController() {  
            TargetViewId = "EmploymentRecord_Skills_ListView";  
        }  
        protected override void OnActivated() {  
            base.OnActivated();  
            if (!(Frame is NestedFrame)) {  
                Frame.GetController<ActionControlsSiteController>().CustomizeContainerActions += LinkSkillsController_CustomizeContainerActions;  
                Frame.GetController<FillActionContainersController>().CustomizeContainerActions += LinkSkillsController_CustomizeContainerActions;  
            }  
        }  
        void LinkSkillsController_CustomizeContainerActions(object sender, CustomizeContainerActionsEventArgs e) {  
            ActionBase linkAction = e.AllActions.Find("Link");  
            ActionBase unlinkAction = e.AllActions.Find("Unlink");  
            if (e.Category == "PopupActions") {  
                e.ContainerActions.Add(linkAction);  
                e.ContainerActions.Add(unlinkAction);  
            }  
        }  
        protected override void OnDeactivated() {  
            base.OnDeactivated();  
            if (!(Frame is NestedFrame)) {  
                Frame.GetController<ActionControlsSiteController>().CustomizeContainerActions -= LinkSkillsController_CustomizeContainerActions;  
                Frame.GetController<FillActionContainersController>().CustomizeContainerActions -= LinkSkillsController_CustomizeContainerActions;  
            }  
        }  
    }  
}  

In addition, it is necessary to commit changes when this ListView is closed:

C#
private void ListSkills_CustomizePopupWindowParams(object sender, CustomizePopupWindowParamsEventArgs e) {  
    Employee employee = View.CurrentObject as Employee;  
    Debug.Assert(employee != null);  
    if (employee.CurrentEmploymentRecord != null) {  
        var nestedSpace = ObjectSpace.CreateNestedObjectSpace();  
        ITypeInfo type = Application.TypesInfo.FindTypeInfo(typeof(EmploymentRecord));  
        PropertyCollectionSource cs = new PropertyCollectionSource(nestedSpace, type.Type, nestedSpace.GetObject(employee.CurrentEmploymentRecord), type.FindMember("Skills"));  
        e.View = Application.CreateListView("EmploymentRecord_Skills_ListView", cs, false);  
        e.DialogController.Accepting += DialogController_Accepting;  
    }  
}  
void DialogController_Accepting(object sender, DialogControllerAcceptingEventArgs e) {  
    ((Controller)sender).Frame.View.ObjectSpace.CommitChanges();  
}  

The DialogController.SaveOnAccept property won't have an effect in a non-root ListView. Note that I have removed your code that populated the Collection Source manually. It is not required, since PropertyCollectionSource is filled with objects from the specified property (Skills) automatically.

Please let me know if you encounter any difficulty with the proposed solution.