Brian - Thanks, although I don't think that's what I'm looking for.

 Basically I am allowing the user to add a node to the three. As soon as the node is added I put it into edit mode, so the user can immediately rename it. It's only after the user types in a new name for the node label, that I want to verify it and if it fails my verification, display a message box to that effect and keep the node label in edit mode.

 Unless I am misstaken, this needs to occur in the AfterLabelEdit event, since I want to check the label text after it's been entered. Is there a way in this AfterLabelEdit event to tell the node to stay in label edit mode?

Use the ValidateLabelEdit event.

this.ultraTree1.Override.Editor = new EditorWithText();
this.ultraTree1.EditorResolved.BeforeExitEditMode += new BeforeExitEditModeEventHandler(EditorResolved_BeforeExitEditMode);

private void EditorResolved_BeforeExitEditMode(object sender, BeforeExitEditModeEventArgs e)
{
    EmbeddableEditorBase editor = sender as EmbeddableEditorBase;

    if ( editor != null )
    {
        if ( string.Equals(editor.CurrentEditText, "foo") == false )
        {
            MessageBox.Show( "Invalid" );
            e.Cancel = true;
        }
    }
}

If you add a node, don't type anything into it and press return, the event does not fire.

Perhaps I am not understanding your request. Please clarify why the following approach does not solve the problem:

private void ultraTree1_ValidateLabelEdit(object sender, ValidateLabelEditEventArgs e)
{
    if ( string.Equals(e.LabelEditText, "foo") == false )
    {
        MessageBox.Show( "Invalid" );
        e.StayInEditMode = true;
    }
}

Hi,

after much scratching of head, it appears that this event doesn't get fired unless the user pressed a key, now in normal circumstances, that's ok, as we can supply a sensible default. The problem which is causing an issue, is that there is a possibility that an error could occur when the default text is used (failure to save data to server etc) the result of which I would like to be able to raise a message and force the node back into edit mode, is there any way to acheive that?

Thanks,

Chris