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                                  • Hi,

                                    One of our customers has detected a problem when upgrading Windows 10 to version 1809. When a window is minimized (iconized), it cannot go back to an open window, having to terminate the application from the task administrator. The same program but with version 1803 works perfectly fine. 

                                    Attach video demo

                                    NOTE: The form with problem is this type

                                      TFrmEscritorio = class(TdxRibbonForm)
                                        ImageList1: TImageList;
                                        PNLintermedio: TPanel;
                                        TimerCorreo: TTimer;

                                     [Attachment removed by DevExpress]

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                                • Paulo (DevExpress Support) 01.24.2019

                                  Hello Josep,

                                  I tested the attached project with Windows 10 1809, but was not able to reproduce this behavior. Would you please modify this example so we can correctly replicate your scenario? In addition, please provide us with the resulting executable file compiled on your machine.
                                  Thanks in advance.

                                • Josep Claret 03.15.2019

                                  Once installed the 1809 version I have been able to test the proposed solution and it effectively works. It also works if you place dxRibbon.SupportNonClientDrawing = FALSE.

                                  But both solutions affect the presentation of the forms.

                                  Is there a correction for this problem?

                                • Paulo (DevExpress Support) 03.18.2019

                                  Hello Josep,

                                  I have created my sample project by using one of our IDE templates (New->Other...->Delphi Projects->DevExpress VCL 18.2~). This project is our standard solution for modern Windows systems that do not support Aero effects. Do you mean that you need the DisableAero property enabled in your project?
                                  Since we were not able to reproduce the original issue on our test machines, it would be great if you provide us with a small example demonstrating it. This may help us create a more general solution.

                                • Josep Claret 03.18.2019

                                  Attached example project.
                                  If DisableAero is not placed: = TRUE the second form (frmstddigi) minimizes it and remains blocked.


                                   [Attachment removed by DevExpress]
                                • Paulo (DevExpress Support) 03.19.2019
                                  Thank you for sharing your sample project! I have reproduced this problem in Windows 1809. It may take us some time to find a general solution.

                                  May I make the content of this ticket visible to other visitors of our site? When we find a solution, it may be useful to them. I can remove all your attachments if necessary.
                                • Josep Claret 03.19.2019

                                  Yes, you can make the ticket visible but please delete all attachments

                                  At the moment we have contained the problem of the client with the DisableAERO but we need a solution as soon as possible



                                • Paulo (DevExpress Support) 03.19.2019
                                  Thanks. I removed all attachments and make this ticket visible to others.

                                1 Solution

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                                • Paulo (DevExpress Support) 04.10.2019

                                  We found that this issue is caused by the incorrect behavior of the 1809 Windows 10 build. In certain cases, Minimized windows do not get the WMNCHitTest message anymore, so buttons cannot be clicked.

                                  The most appropriate solution we found is to use the Ribbon control's skin to paint the caption of the minimized child window. I have published a corresponding patch. Please download and apply it and let me know if it helps.
                                  Thanks in advance.