When you uncomment the line, you move your event handler subs from package main to package gui_test. But Win32::GUI doesn't know that.

To get Win32::GUI to call the event handler for the btnCancel_Click in the new package, I think you need to set the -name of the button to "gui_test::btnCancel".

That seems very impractical, so I never do that in my programs. I use modules and stuff though, but I always place my event handlers in package main, like this

sub ::btnCancel_Click {
[download]

I don't know if that's the right way, or the best way, but it works for me.

/J