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

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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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