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I am thinking of developing a Ext GWT “GXT” 3.0 module that I need to embed to a GXT 2.x web application. Is it a good strategy to load a GXT module in a iframe. I mean, so I can develop the new module using GXT 3 and still “embed” the module in a GXT 2.x based web application. The application is quite big, so I don’t think that there will be anyone in the project team that will be able to adapt to 3.0 just yet.
It is possible to run them together in the same project thanks to them using a different namespace.
http://www.sencha.com/learn/running-ext-gwt-2-and-3-together/
Also if you plan to convert your older GXT2.x modules to GXT3 there is a legacy module to help with the transition. See :
http://www.sencha.com/forum/showthread.php?197973-How-to-use-the-Legacy-module&p=787639&viewfull=1#post787639