public class OurComboBoxAdv : Syncfusion.Windows.Forms.Tools.ComboBoxAdv, ImmBindingList, ImmUISecurityIn the body of the subclassed control are the implementations of ImmUISecurity, ImmBinding, ImmBindingList interfaces, the override of the OnPaint and Text method and property respectively, which is copied from the mmComboBox.cs file. Besides the default (empty) constructor there is this one :
public OurComboBoxAdv(System.ComponentModel.IContainer container) { /// /// Required for Windows.Forms Class Composition Designer support /// container.Add(this); InitializeComponent(); // // TODO: Add any constructor code after InitializeComponent call // }Regards