Check box in qlikview extension properties

[elakkians]

Hi All,

i need to all a check box just next to the expression box in the properties ...

can any one please help me out with the script ..

</div></li></ul>

  <div class='prop-bar-chart-header-clickable' avq='prop_listheader:.Chart.Expression'>Expressions:</div>

  <ul avq='list:.Chart.Expression' class='prop-130 prop-dyn-sortable' tabindex='-1'>

  <li class='ui-state-default prop-sortable-list-li' name='chart-measurement' >

  <span class='prop-sortable-list-arrow-position' avq='list_movehandle:'></span>

  <div class='prop-sortable-item-narrow' avq='prop_editexpression:.0.Definition'></div>

  <div class='prop-sortable-right-width-28px'>

  <div class='prop-sortable-width-28px' name='sortable-list-item-close-button' propicontype='delete-row' avq='prop_buttonjqui:.0.Remove'></div>

  </div></li></ul>