drop down menus

[Drake Steven T DPW ENV NAT RES ITAM(n)]

Newbie question... I would like to add a drop down menu with many choices of
data layers to display. I would like the user to have the option of choosing
none, a combination, or all layers, and keeping them 'on' through re-draws
until toggled 'off' from the same drop down menu. Any suggestions how to go
about this?  

Thank you in advance. 

Steven 

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