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On onclik the row(containing a subgrid ) expands and I get this error

i do this: onclick='mygrid.cells(mygrid.getSelectedRowId(),0).open(); someFunction();'

somefunction contains: 
....
if (mygrid.getSelectedRowId())
  {
  if(mygrid.cells(mygrid.getSelectedRowId(),mygrid.getColumnsNum()-1).getValue()=='' || mygrid.cells(mygrid.getSelectedRowId(),mygrid.getColumnsNum()-1).getValue()=='i' )
  {
  //new route not yet inserted
  alert('<?=JS_INSERT_NEW_ROUTE_BEFORE_ADDING_NEW_STOPS?&gt;');
  return;
  }
  else
  {
  var sub=mygrid.cells(mygrid.getSelectedRowId(),0).getSubGrid();
  if (sub.getRowsNum()&gt;=2 &amp;&amp; sub.cells(sub.getRowId(sub.getRowsNum()-2),0).getValue()=='')
  {
  alert('<?=JS_VALIDATION_STOP_NEW?&gt;');
  return;
  }
  else
  {
  sub.addRow(sub.getRowsNum()+1,'',sub.getRowsNum()+1);
  return;
  }  
  }

  }
  else
  {
  alert('<?=JS_SELECT_ROUTE?&gt;');
  return;
  }

On onclik the row(containing a subgrid ) expands and I get this error: his.hdr.rows[0] has no properties
[Break on this error] for(var i=0;i<this.hdr.rows[0].cells.length;i++){ ,afterward  

if I put an alert(mygrid.getSelectedRowId()); at the begining of the function the error doesn't appear anymore;