RadPanelBar selected item expanding/collapse issue

[Manish Agarwal]

Hi

I am using a RadPanelBar with Hierarchical Data.I want to have first item by default selected when i open that page initially.
I have used "

EngagementList_LayoutUpdated" this method to open the selected item
But in this case i am not able to collapse that selected item.
I have also use "PreviewCollapsed" method then also "LayoutUpdatedLayout" fires in the end.

Please suggest me ASAP how to resolve the issue .Plese mention some code also so that i can better understand.

Regards
Charu Pahuja

[Tihomir Petkov]

Hi Manish,

 You can attach to the ItemContainerGenerator.StatusChanged event and expand the item that you need as soon as its container has been generated:

public MainPage()
{
    InitializeComponent();
    myPanelBar.ItemContainerGenerator.StatusChanged += new EventHandler(ItemContainerGenerator_StatusChanged);
}

void ItemContainerGenerator_StatusChanged(object sender, EventArgs e)
{
    Telerik.Windows.Controls.ItemContainerGenerator generator = sender as Telerik.Windows.Controls.ItemContainerGenerator;
    if (generator != null &&
generator.Status == Telerik.Windows.Controls.Primitives.GeneratorStatus.ContainersGenerated)
    {
        (generator.ContainerFromIndex(0) as RadPanelBarItem).IsExpanded = true;
        myPanelBar.ItemContainerGenerator.StatusChanged -= ItemContainerGenerator_StatusChanged;
    }
}

Let me know if this helps.

All the best,
Tihomir Petkov
the Telerik team

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[Clint Singer]

Hi,

I was wondering if this is still the recommended way to open the first item in the RadPanelBar or has anything improved in the latest version of the framework?

Cheers,
Clint

[Petar Mladenov]

Hi Clint Singer,

 This is a very old post. In Silverlight 4, you can take advantage of telerik's ContainerBindings and bind the IsExpanded / IsSelected property of the RadPanelbar or RadTreeView ( RPB inherits from RTreeView) to a boolean property from your ViewModel. In Silverlight 5, you can do take advantage of StyleBindings, the same way you can do it in WPF 4:

<Style TargetType="telerik:RadTreeViewItem">
      <Setter Property=IsExpanded Value="{Binding ShouldBeExpanded, Mode=TwoWay}"
</Style>

Please let us know if you need further assistance on this.

All the best,
Petar Mladenov
the Telerik team