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I suppose the problem is that after CreateWindow@DialogNotebook the Module's evaluation is finished and Temporary attribute of Module's variables is probably kicking in. Why the first example works the second doesn't? I don't know but how a Temporary attribute works is not documented well. One way to make it work is to use kernel blocking dialog ...


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This will open a dialog notebook created by CreateDialog as soon as you "drive" over the left sideline. final = DynamicModule[{dialogQ = False}, {Graphics[{{White, Thick, Line[{{200, -500}, {200, 175000}}]}, {Yellow, Thick, Dashing[{.1, .05}], Line[{{500, -500}, {500, 175000}}]}, {White, Thick, Line[{{800, -500}, {800, 175000}}]}, ...


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I can not reproduce your problem. I tried the following slightly modified version of your code and it worked fine. I evaluated it in V10.4.1 running under OS X 1.10.2. Manipulate[ dir, {{dir, ""}, None}, Button["Select Directory", dir = SystemDialogInput["Directory"], Method -> "Queued"]] I evaluated the code in new notebook with clean ...



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