[Users] GeoExt action (only allow a one of two actions at a time)

[Purdon]

Given the following actions: http://pastebin.com/GqSwcrmX

How would I only allow one of them to be active at a time? This is more of
a "whats the best way to do this" question. The only solution I could think
of is to configure the Ext.button.Button to deactivate the other button on
it's click event. Is this the best practice for this?

*Kyle W. Purdon*
Research Assistant | Center for Remote Sensing of Ice Sheets (CReSIS)
https://www.cresis.ku.edu/~kpurdon/
Graduate Student | University of Kansas Geography (GIS)
http://www.geog.ku.edu/
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