RE: programmatic sort for Spark datagrid, accounting for sort triangle state

[Kessler CTR Mark J]

I've gone down the road of the sort arrows many times.  Manipulating the 
datagrid.columnHeaderGroup.visibleSortIndicatorIndices never seemed to work for 
me.  It really is inconsistent and the columns themselves have a to change with 
the sortDescending to get the direction.  Then there is that click bug that 
makes some of the sort arrows not update properly.

For an application developer it may be easier to create a modified GridColumn 
that includes a new custom sort property.  Then modify the skin to check for 
that property and the sortDescending to get the direction.  Just use 
preventDefault to disable the internal sort arrows


-Mark

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