/// <summary> /// Default constructor. /// </summary> /// <remarks>Use the <see cref="System.Windows.Forms.NativeWindow.AssignHandle"/> /// method to attach this class to the form you want to show popups from.</remarks> public DropDownWindowHelper() { _filter = new DropDownMessageFilter(this); _filter.DropDownCancel += new DropDownCancelEventHandler(Popup_Cancel); }