How do I create a message box?

I want to know when a particular sub-VI is running when called from another VI. Ideally, I would like a windows-like box to come up, much like a dialog box, that indicates that the sub-VI is running. When execution has completed, I would like to box to disappear, not requiring any additonal user intervention. In Matlab, this is called a waitbar.

Yes, waitbars are very useful when programs are busy and the user is waiting.
As pointed out by the previous answers, the key is to make use of a dialog. In addition to what have been said by the others, I can provide you with a simple implementation of a Waitbar.
In order for using a bar like this is that you have an idea of how much 100% is (time or iterations). In this simple example I just make use of a counter (in a for-loop) and a 25 ms delay to simulate some sort of activity that takes time. You can use a while-loop if that fits your application better. All you need is a number that goes from 0 to 100 during your process.
I used a horizontal graduated bar to make it look similar to the standard waitbars.
In LabVIEW 6i you can declare any VI as a dialog
by right clicking in the upper right corner of the front panel and select VI settings.
I attach my example, MainWB.vi, that is the main VI and WaitBar.vi that is the subVI declared as a dialog and the actual VI that does the work that takes time.
Hope this helps. /Mikael
Attachments:
mainwb.vi ‏6 KB
waitbar.vi ‏19 KB

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