To reproduce: - Add DateTime column and set the RowHeight to 20. - Set the theme to Windows7. - The text is not visible when the editor is shown. Workaround: private void RadGridView2_CellEditorInitialized(object sender, GridViewCellEventArgs e) { RadDateTimeEditor editor = e.ActiveEditor as RadDateTimeEditor; if (editor != null) { var element = editor.EditorElement as RadDateTimeEditorElement; element.Font = new Font("Segoe UI", 8, FontStyle.Regular); element.Children[1].Visibility = ElementVisibility.Collapsed; element.TextBoxElement.ShowBorder = false; element.TextBoxElement.TextBoxItem.HostedControl.MinimumSize = new Size(0, 12); } }