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Custom excell

I have written a custom excell.
I will paste the code here.
Its working fine in fire fox but in IE the height of the cell is not proper.
How can i set height to it?

function eXcell_txtlink(cell)
{
this.cell = cell;
this.grid = this.cell.parentNode.grid;
this.edit = function(){}
this.isDisabled = function(){return true}
this.getValue = function() {var temp=this.cell._rval.split('~');return temp[0];}
this.getTitle=function() {var temp=this.cell._rval.split('~');return temp[1];}
this.setValue=function(val)
{
var txtVal=val.split('~');
var text = txtVal[0].split(',');
var values=txtVal[1].split(',');
var size = values.length;
this.cell.innerHTML="<select id='freqComp' multiple STYLE='width: 150px' size='5'>";
for(i=0;i<size;i++)
{
this.cell.childNodes[0].options[i]=new Option(values[i],text[i]);
}
this.cell.innerHTML+="</select>  <a id='freqAddEdit' href='#' style='cursor: pointer;' onClick='showFreqPopUp(this.id,freqComp)'>Add / Edit </a>"
this.cell._rval =val;
}
}
eXcell_txtlink.prototype = new eXcell;

Sorry but it is not fixing my pbm.

enableMultiline(true) increase row height depending on the it's content. Who does it not work?

I m not able to view the Add/Edit button in IE. Even after enabling the multi line property i m not able to see it. If i do the same thing as normal HTML the height is fine. (Even in IE).
When i make it custom excell and convert into grid. its creating a problem.

Please see example at the attachment.