How to prevent ComboDropDown closing after opening a form

Hi, 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 2.1.0.9. 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. Thanks, Zoltan

Hi Zoltan, The ComboDropDown uses a PopupControlContainer as its dropdown. To prevent the PopupControlContainer from closing when it loses focus, please refer to the following KB article : How do I prevent the popup from disappearing when the user clicks on a Control (that is not a "popup parent")? Let me know if you need any other information. Regards, Guru Patwal Syncfusion, Inc.