How to select the top "n" records from the Cube in Silverlight ?

OlapReport olapReport = new OlapReport();
olapReport.Name = "Customer Report";
olapReport.CurrentCubeName = "Adventure Works";
DimensionElement dimensionElementColumn = new DimensionElement();
//Specifies the Name for the Dimension Element.
dimensionElementColumn.Name = "Customer";
dimensionElementColumn.AddLevel("Customer Geography", "Country");
//Creates the Measure Element.
MeasureElements measureElementColumn = new MeasureElements();
measureElementColumn.Elements.Add(new MeasureElement
{
    Name =
        "Internet Sales Amount"
});
DimensionElement dimensionElementRow = new DimensionElement();
//Specifies the Dimension Name.
dimensionElementRow.Name = "Date";
dimensionElementRow.AddLevel("Fiscal", "Fiscal Year");
//Filters the top 5 elements of the "Internet Sales Amount".
TopCountElement topCountElement = new
TopCountElement(AxisPosition.Categorical, 5);
topCountElement.MeasureName = "Internet Sales Amount";
/// Adds the Column Members.
olapReport.CategoricalElements.Add(dimensionElementColumn);
///Adds the Measure Element.
olapReport.CategoricalElements.Add(measureElementColumn);
///Adds the Measure Element.
olapReport.CategoricalElements.Add(topCountElement);
///Adds the Row Members.
olapReport.SeriesElements.Add(dimensionElementRow);

Dim olapReport As OlapReport = New OlapReport()
olapReport.Name = "Customer Report"
olapReport.CurrentCubeName = "Adventure Works"
Dim dimensionElementColumn As DimensionElement = New DimensionElement()
'Specifeis the Name for the Dimension Element.
dimensionElementColumn.Name = "Customer"
dimensionElementColumn.AddLevel("Customer Geography", "Country")
'Creates the Measure Element.
Dim measureElementColumn As MeasureElements = New MeasureElements()
measureElementColumn.Elements.Add(New MeasureElement With {.Name = "Internet Sales Amount"})
Dim dimensionElementRow As DimensionElement = New DimensionElement()
'Specifies the Dimension Name.
dimensionElementRow.Name = "Date"
dimensionElementRow.AddLevel("Fiscal", "Fiscal Year")
'Filters the top 5 elements of "Internet Sales Amount".
Dim topCountElement As TopCountElement = New TopCountElement(AxisPosition.Categorical, 5)
topCountElement.MeasureName = "Internet Sales Amount"
''' Adds the Column Members.
olapReport.CategoricalElements.Add(dimensionElementColumn)
'''Adds the Measure Element.
olapReport.CategoricalElements.Add(measureElementColumn)
'''Adds the Measure Element.
olapReport.CategoricalElements.Add(topCountElement)
'''Adds the Row Members.
olapReport.SeriesElements.Add(dimensionElementRow)