date sorting in grid

Hello,

if i sort a “dhxCalendarA” with sort “date”.
The emtpy fields are treated as the date of today.

It looks like this:
12.04.2011
14.04.2011
(empty)
30.05.2011

How can this problem be fixed?

It should look like this:
(empty)
12.04.2011
14.04.2011
30.05.2011

Unfortunately the issue cannot be perfomed localy.
Look at this sample for more information. http://www.dhtmlx.com/docs/products/dhtmlxGrid/samples/01_cell_types/01_calendar_grid.html
If issue still occurs for you please provide any kind of sample or a demo link so we can reproduce this issue locally