How to force dialog windows to be displayed in front?

When I open a zenity dialog window with bash, the window is always displayed in the background rather than in front of the terminal window. For example

zenity --info --title='Just a title' --text='This is my text'

This is bothering me as the user has to click on the zenity window a first time to bring it forward and then a second time to hit the button (s)he wants. Is it possible to force the zenity window to be displayed in front of the terminal window?

I am on OSX 10.11.5

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