To reproduce: RadMenuItem item = new RadMenuItem(); item.Text = "Item1"; RadMenuComboItem comboItem = new RadMenuComboItem(); comboItem.ComboBoxElement.DropDownStyle = RadDropDownStyle.DropDownList; comboItem.Items.Add("meters"); comboItem.Items.Add("feet"); item.Items.Add(comboItem); this.radApplicationMenu1.Items.Add(item); The undesired behavior is illustrated better in the attached file. Workaround: item.DropDownClosing += item_DropDownClosing; comboItem.ComboBoxElement.EditableElement.MouseDown += EditableElement_MouseDown; comboItem.ComboBoxElement.EditableElement.MouseUp += EditableElement_MouseUp; bool shouldCancel = false; private void EditableElement_MouseUp(object sender, MouseEventArgs e) { shouldCancel = false; } private void EditableElement_MouseDown(object sender, MouseEventArgs e) { shouldCancel = true; } private void item_DropDownClosing(object sender, RadPopupClosingEventArgs args) { args.Cancel = shouldCancel; } private void ComboBoxElement_SelectedIndexChanged(object sender, PositionChangedEventArgs e) { RadDropDownListElement ddle = sender as RadDropDownListElement; if (ddle != null && e.Position < ddle.Items.Count) { RadMessageBox.Show(ddle.Items[e.Position].Text); } }