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Problems with ordering

i have the following list in a column :

b
B
a
A


if I order it ascending

they are ordered like
A
B
a
b

witch is not what I want

I need it to be ordered like
a
A
b
B

or
A
a
B
b

By default the sorting is case sensitive, you can change behavior by using custom sorting. 
Please check 
       http://dhtmlx.com/docs/products/dhtmlxGrid/doc/articles/Sorting_in_grid.html#grid_art_sort
"Case insensitive sorting" section