RadGrid in AjaxControlKit ModalPopup weird Filter behaviour

[Timothy]

I have a RadGrid loaded in a dynamically created ModalPopup when doing a filter on the columns from the HeaderContextMenu
snippets shown below
AllowFilteringByColumn="True" AllowAutomaticDeletes="True" CellSpacing="0" DataSourceID="theGridViewSqlDataSource" CssClass="gridview" Width="780" AutoGenerateColumns="False" EnableHeaderContextFilterMenu="True" EnableHeaderContextMenu="True" ShowStatusBar="true"
<MasterTableView DataSourceID="theGridViewSqlDataSource" BorderStyle="Solid" Width="100%" DataKeyNames="ID" IsFilterItemExpanded="false" GridLines="Both" ShowGroupFooter="true" >

With some versions of Chrome, IE9 but not Firefox and IE8 the Filtering action invokes a full Postback. The ModalPopups are in an UpdatePanel all by themselves on the MasterPage. When using developer tools in Chrome and IE9 I can see that the Async Postback is cancelled and it is then followed by a full page postback.

All other functions on the RadGrid work as expected, paging, grouping, adding and deleting records etc.

Any ideas???

[Tsvetina]

Hello Timothy,

Can you confirm if you have enabled auto postback on filter for the columns? If so, try disabling this option and see if this fixes the problem. If so, update your RadControls to the latest version.
Also, you could check which control and with what argument does fire the consequtive postback, so you know where to look for unwanted postback behavior.
Let us know about any further details which you notice about this problem.

Greetings,
Tsvetina
the Telerik team