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updating one popup menu instantly after a string is chosen in another popup menu

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I have three popup menus, the first which is to select a country. I want to set that when a country is chosen, the second popup menu will automatically go to the cities for that country . and after the city is chosen the third popup menu will fill with the airports of that city. I want all these changes at the same menu, and without the need of using refresh pushbutton. is that possible?
I would really appreciate if you help me with my problem.

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Walter Roberson
Walter Roberson 15 May 2015
Yes, each popup is a uicontrol(), and each uicontrol may have a callback function. The action of one callback can be to set() the 'String' of another uicontrol so that it has a different selection of popup entries.

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