# OnClientTogglePlannedTasks

The **OnClientTogglePlannedTasks** occurs upon Toolbar PlannedTasks Switch click. As a result, the planned tasks will be either hidden or shown in the Gantt Timeline view. Event can be canceled. The equivalent of Kendo UI Gantt [togglePlannedTasks event](https://docs.telerik.com/kendo-ui/api/javascript/ui/gantt/events/toggleplannedtasks).

The event handler receives two parameters:

1. The instance of the **Gantt** control firing the event.

2. An **eventArgs** parameter containing the following methods:

* **get_showPlannedTasks** returns a boolean indicating whether the planned tasks are about to be shown (true) or hidden (false)..

* **set_cancel** lets you cancel the event and prevent the planned task toggle.

* **get_cancel** returns **true** if the event has been canceled.

* **get_sender** returns the underlying Kendo UI Gantt widget that fired the event.

```ASP.NET
<telerik:RadGantt RenderMode="Lightweight" runat="server" id="RadGantt1" OnClientTogglePlannedTasks="OnClientTogglePlannedTasks">
</telerik:RadGantt>
```

```JavaScript
function OnClientTogglePlannedTasks(sender, eventArgs) {
    args.set_cancel(true);
}
```

## See Also

* [Client-Side Basics](https://www.telerik.com/products/aspnet-ajax/documentation/controls/gantt/client-side-programming/overview)

* [Client-Side Events](https://www.telerik.com/products/aspnet-ajax/documentation/controls/gantt/client-side-programming/events/overview)