Make Sub grid mandatory.

Hi,

Need help ! I want sub grid to be mandatory for user.

Users' must add value in Sub grid present on my contact form. After saving a new contact subgrid is seen and user must add a record into the subgrid is my requirement .

To achieve the above I used a js on save click ,as below :

function OpenSectorRegionMarket()
{

var windowOptions = {
 openInNewWindow: true
};

  var SectorRegionMarketrows = Xrm.Page.getControl("SectorRegionMarket").getGrid().getTotalRecordCount();
  if ( SectorRegionMarketrows <= 0) {
   Xrm.Utility.openEntityForm("entityname",null,null,windowOptions );
  }
}

but , value is not being associated with the contact nor it is opening in new window.

Regards,

Priya