how to bring up keepassX window with keyboard shortcut?

Is there any way to bring up the keepassX window when the application is started but the window is hidden? I mean that the application is running but only the icon in the notification area is visible. Is there any way to do this? Is there any way to configure a shortcut?

Not strictly an answer for KeepassX and kind of a workaround...

I tend to use xdotool in those cases, it's great for window tinkering and automation.

You could do something like xdotool search --name keepassX windowactivate
Just make sure --name is the same as the window title.

And then make a keyboard shortcut to that command or put it in Keepass's launcher.