How to disalbe dragover capture on RadTreeListView columns header

[Jiri]

How can I disable dragover capture on RadTreeListView columns headers in case like example below? I would like to not have impossible drop visual in case of dragging over column headers.

Example:

<telerik:RadTreeListView x:Name="radTreeListView"AutoGenerateColumns="False">

  <telerik:RadTreeListView.ChildTableDefinitions>

    <telerik:TreeListViewTableDefinition ItemsSource="{Binding Items}"/>       

  </telerik:RadTreeListView.ChildTableDefinitions>

  <telerik:RadTreeListView.Columns>

    <telerik:GridViewDataColumn DataMemberBinding="{Binding Name}"Header="Name" />

    <telerik:GridViewDataColumn DataMemberBinding="{Binding Count}"Header="Count"  />

    </telerik:RadTreeListView.Columns>
</telerik:RadTreeListView>

[Stefan Nenchev]

Hello Jiri,

Please try the following approach:

InitializeComponent();
           this.RadTreeListView1.AddHandler(GridViewHeaderCell.DragOverEvent, new DragEventHandler(OnGridViewHeaderCellDrop), true);
       }

 private void OnGridViewHeaderCellDrop(object sender, DragEventArgs e)
       {
           e.Effects = DragDropEffects.All;
       }

Regards,
Stefan Nenchev
Telerik by Progress

[Jiri]

I have already register handler for DragOverEvent. Without that would be impossible to drop items off columns header. So second registration is not possible.

Beside this problem I am getting ArgumentException on AddHandler call (Handler type is mismatched).

[Stefan Nenchev]

Hi Jiri,

You can try setting .Effects in the already registered event handler. 

Regards,
Stefan Nenchev
Telerik by Progress