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Unable to Drag a row inside the grid

Hi

Im unable to drag a row within the grid . I have done mygrid.enableDragandDrop(true). and have also included the dhtmlXGrid_drag.js but still not able to do it . I also disable the LightMouseNavigation and enableMultiLineSelect(false). All i coud get is that the color of the target row changes to pink but no dragging actually happens . ..

I have a 15 column grid of which column of which 5,6,9,10 are date type and remaining are all "ed" type .
This is my XML file for constructing the initial empty grid.
<?xml version="1.0" encoding="UTF-8"?>
<rows>
<userdata name="gud1">
        userdata value 1
    </userdata>
    <userdata name="gud2">
        userdata value 2
    </userdata>
    <row id="task1" selected="1" call="1" xmlkids="1">
        <cell >1</cell>
        <cell> </cell>
        <cell> </cell>
        <cell></cell>
        <cell></cell>
        <cell> </cell>
        <cell> </cell>
        <cell> </cell>
        <cell> </cell>
        <cell> </cell>
        <cell> </cell>
        <cell> </cell>
        <cell> </cell>
        <cell> </cell>
        <cell> </cell>
        
    </row>
    <row id="task2" selected="1" call="1" xmlkids="1">
        <cell>2</cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>

    <row id="task3" selected="1" call="1" xmlkids="1">
        <cell>3</cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task4" selected="1" call="1" xmlkids="1">
        <cell>3</cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task5" selected="1" call="1" xmlkids="1">
        <cell>5</cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task6" selected="1" call="1" xmlkids="1">
        <cell>6</cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task7" selected="1" call="1" xmlkids="1">
        <cell>7</cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task8" selected="1" call="1" xmlkids="1">
        <cell>8</cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task9" selected="1" call="1" xmlkids="1">
        <cell>9</cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task10" selected="1" call="1" xmlkids="1">
        <cell>10</cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task11" selected="1" call="1" xmlkids="1">
        <cell></cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task12" selected="1" call="1" xmlkids="1">
        <cell></cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task13" selected="1" call="1" xmlkids="1">
        <cell></cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task14" selected="1" call="1" xmlkids="1">
        <cell></cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task15" selected="1" call="1" xmlkids="1">
        <cell></cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task16" selected="1" call="1" xmlkids="1">
        <cell></cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task17" selected="1" call="1" xmlkids="1">
        <cell></cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task18" selected="1" call="1" xmlkids="1">
        <cell></cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task19" selected="1" call="1" xmlkids="1">
        <cell></cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task20" selected="1" call="1" xmlkids="1">
        <cell></cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task21" selected="1" call="1" xmlkids="1">
        <cell></cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task22" selected="1" call="1" xmlkids="1">
        <cell></cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task23" selected="1" call="1" xmlkids="1">
        <cell></cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task24" selected="1" call="1" xmlkids="1">
        <cell></cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task25" selected="1" call="1" xmlkids="1">
        <cell></cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task26" selected="1" call="1" xmlkids="1">
        <cell></cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task27" selected="1" call="1" xmlkids="1">
        <cell></cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
    <row id="task28" selected="1" call="1" xmlkids="1">
        <cell></cell>
        <userdata name="hondaUD">
            userdata value for honda
        </userdata>
        <cell></cell>
    </row>
</rows>

Problem not reconstructable locally - please check attached sample, it uses the same XML and  standard js files - all works correctly