How to clear filter on Telerik ASP.NET MVC Grid

Question

I have a grid that allows the user to filter. If the user changes the search word that is used to populate the grid, the filter from the previous search remains in place.

<label for="UserName"> 
    User Name:</label> 
<%= Html.TextBox("UserName", "") %> 
&nbsp; &nbsp; 
<input id="btnSearch" type="submit" value="Submit" /> 
</p> 
<div class="<%= "t-" + Html.GetCurrentTheme() %>" style="width: 400px;"> 
<%= Html.Telerik().Grid<ADGroup>()       
        .Name("Groups") 
        .Columns(columns=> 
        { 
            columns.Add(c => c.GroupName).Width(350); 
        }) 
        .Sortable() 
        .Filterable() 
        .Pageable(paging => 
            paging.PageSize(20) 
        ) 
        .Ajax(ajax => ajax.Action("_GetGroups", "GroupSearch", new { userName = "John Doh" })) 
        .BindTo((IEnumerable<ADGroup>)ViewData["Groups"]) 
%> 
</div> 

I have triggered the rebind of the gird to occur when btnSearch is pressed.

<% 
Html.Telerik().ScriptRegistrar() 
    .OnDocumentReady(() =>  
    { 
    %> 
    var groupsGrid = $('#Groups').data('tGrid'); 
    $('#btnSearch') 
        .live("click", function() { 
            var user = $('#UserName').val(); 
            // rebind the related grid 
            groupsGrid.rebind({ 
                userName: user 
            }); 
        }); 
    <%  
}); 

%>

I know that I can add the following code which will bring up the filter menu, but I'd prefer to be able to automagically clear the filter before or after the .rebind() call occurs.

$('.t-grid-filter:first') 
     .trigger('click'); 

Answer 1

With korchev's inspiration... I came up with the following that is executed before the rebind occurs. It clears out the filter values and then applies the new (non-existent) values.

//Clear UI Filter Text
$('#Groups .t-clear-button').click();
$('#Groups .t-filter-button').click();

// rebind the related grid
groupsGrid.rebind({
    userName: user
});