When loading data from a webservice to be shown in a datagrid it seemed that all values in the grid are treated as string-values. So when sorting numeric columns the values were not in the correct order.

Instead of:
1 - 2 - 3 - 4 - 11 - 12 -21
You get:
1 - 11 - 12 - 2 - 21 - 3 - 4

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harshley