I checked it again with AllowCellEdit property set to ReadOnly. It turned out that what you wrote is true when the TextBox has focus and displays a prompt char, but it requires user to click first on a text and then on editors' associated button.

Is there any other way of adding a CLICKABLE button to a tree cell besides implementing a custom EmbbedableEditor? If there isn't any could you give me some tips how to implement such editor?

ps. I'm using NetAdvantage v8.3 (2021).

Regards,
Pawel

Thanks for the workaround, works like a charm!

Regards,

Pawel

Yes, I see now that you did mention you wanted the button to cover the whole cell, sorry I rushed over that part. I was able to hack this out by changing AllowCellEdit as the cell goes in an out of edit mode:

EditorWithText editor = new EditorWithText();
column.Editor = editor;
editor.ButtonsLeft.Add(button);
editor.BeforeEnterEditMode += new CancelEventHandler(editor_BeforeEnterEditMode);
editor.BeforeExitEditMode += new BeforeExitEditModeEventHandler(editor_BeforeExitEditMode);
editor.EditorButtonClick += new Infragistics.Win.UltraWinEditors.EditorButtonEventHandler(editor_EditorButtonClick);          

void editor_BeforeExitEditMode(object sender, BeforeExitEditModeEventArgs e)
{
    EmbeddableEditorBase editor = sender as EmbeddableEditorBase;
    this.OnEditModeChanged( editor, false );
}

void editor_BeforeEnterEditMode(object sender, CancelEventArgs e)
{
    EmbeddableEditorBase editor = sender as EmbeddableEditorBase;
    this.OnEditModeChanged( editor, true );
}

private void OnEditModeChanged( EmbeddableEditorBase editor, bool entering )
{
    EmbeddableUIElementBase embeddableElement = editor != null ? editor.ElementBeingEdited : null;
    UltraTreeNodeCellUIElement cellElement = embeddableElement.GetAncestor( typeof(UltraTreeNodeCellUIElement) ) as UltraTreeNodeCellUIElement;
    if ( cellElement != null )
        cellElement.Column.AllowCellEdit = entering ? AllowCellEdit.ReadOnly : AllowCellEdit.Full;
}