Lookup method for form data source field using Extension in D365.

Hi all,

I am trying to create lookup method for form data source field using form extension ,as we all know there is no event handler for lookup for data source field so how can i achieve the solution?

public void lookup(FormControl _formControl, str _filterStr)
{
if (table.AccountCode == TableGroupAll::Table)
{

 super(_formControl, _filterStr);
}
else
{
  ChainGroup::lookup(_formControl,fieldNum(ChainGroup,Field);
}
}

Thanks and Regards

Prabhakaran