I have ComboDropDown placed in UserControl. The popup control is a WindowsForm''s TreeView. I have context menu on TreeView that activates new form in order to add a new node (Syncfusion 18.104.22.168. with .NET Framework 1.1. Sp1).
After I open the form the keyboard focus is on combo''s PopupContainer. If I focus the form by mouse click (or tab) the pop-up part of combo box closes.
It is strange that if I activate a MessageBox instead of form the pop-up parts remains open.
Please, help how to prevent closing the pop-up part.