Using more than one front panel at the same time

I have a main program where I can call sub vi’s and then the sub vi’s front panel opens.
I want to use/see/operate more than one front panel at the same time. How I can do it?
For example when I close the main program it won’t close before I close all the sub vi’s front panels.
I use event case to call these sub vi’s. Can I close all vi's using one button?

I wouldn't use subVIs for display, at least not if you plan to have them open all the time. Instead, I would suggest that you have one loop with a FP VI which will talk to the FP all the time and will pass to the data to the other loops through a variable or a functional global.
Then, you can use a tab control to organize your display. If there is no specific reason for not having the graphs in the same VI, you can use a tab control to organize it. If you can't, you can also use subpanels to display the VIs and put several subpanels in your VI.
If you still want to display the VIs seperately, you can control their positions and sizes through their proerty nodes, but I don't think there's any reason for this.
To learn more, I suggest you read the LabVIEW style guide. I think it has some tips about application design.
Try to take over the world!

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