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Binding to IsExpanded

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TreeListView
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Tim
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Tim asked on 07 Dec 2011, 12:28 PM
Hello.

I've read several forum entries concerning this and it does not sound good:
"and with latest versions of RadTreeListView binding to IsExpanded is not supported."
After this I've read something about StyleSelectors and some other stuff about RowLoaded events...

So, my question: What is the best way to do it with the current version?
Thanks a lot for any kind of information!!!

All the best,
Tim.

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Dimitrina
Telerik team
answered on 08 Dec 2011, 05:17 PM
Hi Tim,

 
You could  bind the "IsExpanded" property using a RowStyleSelector like so: 

1. Create a StyleSelector (you need to have a property IsExpanded for the bound item):

public class CustomStyleSelector : StyleSelector
    {
        public override Style SelectStyle(object item, DependencyObject container)
        {
            if(container is TreeListViewRow)
            {
    
                if(item is ClientCategory)
                {
                    Style style = new Style() { TargetType=typeof(TreeListViewRow)};
    
                    style.Setters.Add(new Setter(TreeListViewRow.IsExpandedProperty, ((ClientCategory)item).IsExpanded));
    
                    return style;
                }
            }
            return base.SelectStyle(item, container);
        }
    }

2. Then apply this style as a RowStyleSelector for the TreeListView:

<Grid.Resources>
            <local:CustomStyleSelectorx:Key="CustomSelector"/>
</Grid.Resources>  ...
<telerik:RadTreeListView x:Name="tlv" RowStyleSelector="{StaticResource CustomSelector}"/>

This is the best way to do it with the current version.

All the best,
Didie
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Tim
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answered on 08 Dec 2011, 05:35 PM
Didie, thanks A LOT!!!
All the best,Tim.
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Tim
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