How to prevent closing of combo box when an item is selected

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I have a ComboBox like the following and would like to prevent it closing when I click the header section (e.g. Administrators). I just tried the following code. private void cmboName_SelectedIndexChanged(object sender, EventArgs e) { if (cmboName.SelectedIndex == 1) { cmboName.DroppedDown = true; return; } } But there is a shivering happens; first combo box will be closed and then opens.