How to set the position of the ASP.NET Ajax ModalPopupExtender?

<AjaxToolkit:ModalPopupExtender ...otherproperties...

     X="100" Y="300">

</AjaxToolkit:ModalPopupExtender>

Telerik Radgrid load grouping at Client Side

 <MasterTableView GroupLoadMode="Client">

Telerik Rad Grid Nested Grouping

 <MasterTableView GroupLoadMode="Client">

   <GroupByExpressions>

    <telerik:GridGroupByExpression >

    <GroupByFields>                                               

    <telerik:GridGroupByField FieldName="status"  />

    </GroupByFields>

    <SelectFields>

    <telerik:GridGroupByField FieldName="status" HeaderValueSeparator="" HeaderText=" " FieldAlias="status" />

     </SelectFields>

     </telerik:GridGroupByExpression>

     <telerik:GridGroupByExpression >

     <GroupByFields>                                               

     <telerik:GridGroupByField FieldName="date"  />

     </GroupByFields>

     <SelectFields>

       <telerik:GridGroupByField FieldName="date" HeaderValueSeparator="" HeaderText=" " FieldAlias="Test" />

       </SelectFields>

       </telerik:GridGroupByExpression>

       </GroupByExpressions>

       </MasterTableView>

Group by column in Telerik Rad grid

 <MasterTableView GroupLoadMode="Client">

   <GroupByExpressions>

    <telerik:GridGroupByExpression >

    <GroupByFields>                                               

    <telerik:GridGroupByField FieldName="status"  />

    </GroupByFields>

    <SelectFields>

    <telerik:GridGroupByField FieldName="status" HeaderValueSeparator="" HeaderText=" " FieldAlias="status" />

     </SelectFields>

     </telerik:GridGroupByExpression>  

</GroupByExpressions>

</MasterTableView>