ASPxClientGanttResourceManagerDialogShowingEventArgs Class

<dx:ASPxGantt ID="Gantt" >
    <ClientSideEvents ResourceManagerDialogShowing="function(s, e) {
        // ...
        // Cancels the dialog.
        e.cancel = true;
    }" />
</dx:ASPxGantt>

@Html.DevExpress().Gantt(settings => {
    settings.Name = "gantt";
    settings.ClientSideEvents.ResourceManagerDialogShowing = "function (s, e) { 
        // ...
        // Cancels the dialog.
        e.cancel = true;
    }";
    ...
}).Bind(
    GanttDataProvider.Tasks, GanttDataProvider.Dependencies, 
    GanttDataProvider.Resources, GanttDataProvider.ResourceAssignments
).GetHtml()