treeview.Edited Event Cant make modal dialog

[Ji -Won]

Hello..
I tried MessageBox or InstanceForm.showDialog that couldn work at Edited Event.

this is Sample Code.

radTreeView1_Edited(object sender, TreeNodeEditedEventArgs e)
{
    DialogResult result = MessageBox.Show("will you change?","Change",MessageBoxButtons.OkCancel);
    if(result != DialogResult.Ok)
    {
        e.cancel=true;
    }
}

at MessageBox.Show Line make Error Message.
attatch file is that window  


So I tried make new thread and give to delay.. but that way 
also if delay is so short or
when that action time
if I minimize or doesn focus.
that showed me similar Error.
Plz Give me a Solution.....

Thanks.

[Svett]

Hello,

Thank you for writing.

The illustrated behavior occurs because you are causing the tree view control to loose its focus in the Editing event. You can work around it by creating custom tree view in the following manner:

public class MyTreeView : RadTreeView
{
    public MyTreeView()
    {
        this.ThemeClassName = typeof(RadTreeView).FullName;
    }

    protected override void OnLostFocus(System.EventArgs e)
    {

    }
}

I hope this helps. Let us know if you have any other questions.

Regards,
Svett
the Telerik team