Windows Presentation Foundation
A part of the .NET Framework that provides a unified programming model for building line-of-business desktop applications on Windows.
2,788 questions
Window shown in alt tab menu even included tool window style
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(281.6, 45%, 37%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EP%3C/text%3E%3C/svg%3E)
phongla
0
Reputation points
I am working with wpf application that create a transparent, topmost window. I also set tool window style for my window by using: SetWindowLong(hwnd, GWL_EXSTYLE, extendedStyle | WS_EX_TOOLWINDOW). It is ok during application running but when I go to Task Manager (Details tab) and "End task" the explorer.exe then start it again by clicking run new task, my application's windows will be shown in alt tab area even it still include ToolWindow style normally (I checked by Spy++).
One more important note that I cannot reproduce that issue if run application directly but if I use a service to start the application with UI access token (SetTokenInformation(hUserToken, TOKEN_INFORMATION_CLASS.TokenUIAccess, ref dwUIAccess, sizeof(uint))) . I can reproduce the issue. Can anyone help me to explain the reason?
Windows Presentation Foundation
C#
C#
An object-oriented and type-safe programming language that has its roots in the C family of languages and includes support for component-oriented programming.
11,054 questions
{count} votes
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Viorel 118.4K Reputation points2024-11-15T06:57:41.3833333+00:00 Did you also try to change the ShowInTaskbar property of the window?
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(51.2, 62%, 14%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EHY%3C/text%3E%3C/svg%3E)
Hongrui Yu-MSFT 3,015 Reputation points Microsoft Vendor2024-11-18T06:22:28.1966667+00:00 Hi,@phongla. Welcome to Microsoft Q&A.
Is there any update to the question? Has your problem been solved? If so, you could share it here. If you still have problems, please share with me the sample code that can reproduce the problem for analysis.
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Hongrui Yu-MSFT 3,015 Reputation points Microsoft Vendor
2024-11-20T07:04:52.3833333+00:00 Hi,@phongla.
Are there any more updates to the question? Has your problem been solved? If it is solved, you could share it here. If there are still problems, please further describe the situation of your project (project structure, minimum reproducible code, execution steps, expected results) so that I could further provide analysis and answers.
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Hongrui Yu-MSFT 3,015 Reputation points Microsoft Vendor
2024-11-22T01:03:33.5866667+00:00 Hi,@phongla.
Did you solve your problem? If you found a solution, you could share it here to help others in the community who have similar problems. If you still have problems, you could describe your problem in more detail and I will further analyze and answer it for you.
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