Show reassuring message while calculating
I have a calculation that takes some time to execute, especially when the internal network connection is slow (say 10 seconds). During this time, the user is wondering what is happening. I would like to reassure the user that something is in fact happening, by flashing up a little message, like a dialog box. The message could say "Calculating..." or similar. I do not want to delay the process, and I do not want to require any input from the user. I would like the message to disappear once the calculation is completed.
Can anyone suggest how to achieve this?
I am using FileMaker 12 Advanced.