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Program is not visible in Windows ALT+TAB

Posted on 2014-10-10
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Last Modified: 2014-10-17
Hi,

When I start my Delphi application and press Windows ALT+TAB the app will show in the list of available application where one can jump to. But as soon as I open another form (Form2.ShowModal), than the application disappears from the ALT-TAB list.

Is there a way to solve this?
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Question by:Delphiwizard
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4 Comments
 
LVL 19

Accepted Solution

by:
Zaheer Iqbal earned 2000 total points
ID: 40372667
It's a Feature of Windows 7, and not a bug.

The solution is to either remove the 'Tool window' from the Dialog Properties, or to remove 'WS_EX_TOOLWINDOW' from the RC file.

If you want to restore the expected Win XP behavior, just add a DWORD registry key named

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\AltTabSettings

And set the value to 1
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Author Comment

by:Delphiwizard
ID: 40372729
How does one remove 'WS_EX_TOOLWINDOW' from the RC file?
Is this a one-time only action on application-level or needs this to be done for every (new) toolwindow?

Changing the registry result in ALT-TAB in the old Windows XP-stype which is not the desired outcome.
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LVL 19

Expert Comment

by:Thommy
ID: 40372763
@1stITMAN: don't adorn yourself with borrowed plumes!!!

You have taken your answer from App disappears from Win7's ALT-TAB list sometimes without citing the source...
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Author Closing Comment

by:Delphiwizard
ID: 40386104
First I hoped for a workaround by code to make the toolbox window available ofr ALT+TAB, but I've decided to go for the lean and mean approach. So I changed all Toolbox forms to type Dialog.
This solved it perfectly. Thank you for sharing the solution of others, it works for me :-).
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