How to show the dropdown when the ComboBox (ComboBoxAdv) is in ReadOnly in WinForms?

Dropdown settings

You can display dropdown of ComboBoxAdv when its textpart is ReadOnly by setting ReadOnly for textpart of ComboBoxAdv as follows

this.comboBoxAdv1.TextBox.ReadOnly = true;

Me.comboBoxAdv1.TextBox.ReadOnly = TRUE

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