Kendo MVC grid with ClientGroupHeaderTemplate with ClientTemplate checkboxes validation - kendo-ui

Question

I am using Kendo MVC grid with ClientGroupHeaderTemplate with ClientTemplate checkboxes as one of the column. Under each group there are check boxes, At least one check box should be selected under each group. How do I loop through each groups and validate if check box is checked or not. Please help.
#(Html.Kendo().Grid<Arthama.Web.GlobalvaluesModels.Model.Model>()
.Name("grid")
.Columns(columns =>
{
columns.Bound(c => c.Type).Title("Type").ClientGroupHeaderTemplate("#= items[0].Type#").Hidden(true);
columns.Bound(p => p.Text).Visible(true).Width(50).Title("SubType").Filterable(x => x.Cell(y => y.Template("template").ShowOperators(false).Operator("contains")));
columns.Bound(p => p.Value).Visible(false).Width(50).Title("Value");
columns.Bound(c => c.Check).Width(40).Title("Check").ClientTemplate("<input name='Check' type='checkbox' #= Check? checked='checked': '' # class='chk_row' />").HtmlAttributes(new { style = "text-align: center" }).Filterable(false).HeaderHtmlAttributes(new { style = "text-align:center" }).Filterable(false).Sortable(false);
})
.HtmlAttributes(new { #style = "height:390px;" })
.Filterable(ftb => ftb.Mode(GridFilterMode.Row))
.AutoBind(false)
.DataSource(dataSource => dataSource
.Ajax()
.Sort(x => x.Add("Check").Descending())
.Group(group => group.Add(p => p.Type))
.Batch(true)
.ServerOperation(false)
.PageSize(1000)
.Read(read => read.Action("Action", "Controller").Data("param"))
)
.Pageable()
.Sortable()
.Events(e => e.DataBound("DBound"))
.Scrollable()
.Resizable(resize => resize.Columns(true))
)
This is what I am trying, but this won't loop through groups
var len = $("#grid").data("kendoGrid").dataSource.data().length;
var data = $("#grid").data("kendoGrid").dataSource.data();
for (i = 0; i < len; i++) {
if (data[i].Check=== true) {
}
}