When i send header name in xml for grid that time alternatecss is not working .

when i set grid header in js alternatecss is fine .

Problem can’t be reconstructed locally.
Beware, that if you are using column@color attribute to set column colors - the grid will use provided value to color all rows, instead of alter-css colors.

If issue still occurs for you - please provide any kind of sample where problem can be reconstructed.