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I missed this from two versions ago or so, but Spry has a new attribute to make master/detail work a bit easier. In the past, you would typically use code like this to display a set of data and allow a user to click to load a detail region:

<tr spry:repeat="mydata" onclick="mydata.setCurrentRow('{ds_RowID}');">

Notice the onclick? This tells Spry to update the current selected row. This is now done like so:

<tr spry:repeat="mydata" spry:setrow="mydata">

Love it. One more line of JavaScript removed.