[Solved] Scrolling radbox clears selection

[Fabio]

Hi, I have a strange behaviour in a scrolled radgrid, using server-side selection.

Markup:

<telerik:RadGrid ID="rgCT" runat="server" Width="345" OnNeedDataSource="rgCT_NeedDataSource"
                             AutoGenerateColumns="false" EnableAjaxSkinRendering="true" AllowMultiRowSelection="true">
                <PagerStyle Mode="NextPrevAndNumeric" />
                <SelectedItemStyle BackColor="Gray" ForeColor="White" />
                <EditItemStyle BackColor="#F7BD02" ForeColor="Black" />
                <MasterTableView TableLayout="Fixed" CommandItemDisplay="None" DataKeyNames="CT_ID">
                    <Columns>
                        <telerik:GridTemplateColumn UniqueName="Selection" HeaderStyle-Width="10%">
                            <ItemTemplate>
                                <asp:CheckBox ID="CheckBox1" OnCheckedChanged="ToggleRowSelection" AutoPostBack="True"
                                    runat="server"></asp:CheckBox>
                            </ItemTemplate>
                        </telerik:GridTemplateColumn>
                        <telerik:GridBoundColumn UniqueName="CT_ID" DataField="CT_ID" Visible="false" />
                        <telerik:GridBoundColumn UniqueName="CT_NAME" DataField="CT_NAME" HeaderText="CT" HeaderStyle-Width="89%"/>
                    </Columns>
                </MasterTableView>
                <ClientSettings>
                    <Scrolling AllowScroll="True" UseStaticHeaders="True" SaveScrollPosition="True"
                               ScrollHeight="200px"  />
                </ClientSettings>
            </telerik:RadGrid>

Code-behind:

        protected void ToggleRowSelection(object sender, EventArgs e)
        {
            ((sender as CheckBox).Parent.Parent as GridItem).Selected = (sender as CheckBox).Checked;
        }

When I touch the vertical scrollbar (even if I don't really "scroll") the selection get cleared.
I see this in the onclick of a button, checking the SelectedIndexes.Count property of the Grid.
When I don't touch the scrollbar all selections are preserved, when I touch it the SelectedIndexes.Count is 0.

Any clue?

Thanks in advance for your help.

[Shinu]

Hi Fabio,

I also had a similar problem.  But in my case the the CheckBox remains checked even though the Grid row selection is gone. I have given a work around for this in the following forum post. You may go through it and see if it helps.
Major Problem: Grid loses SelectedItems on Client Scroll

Shinu