How to detect if a column was dragged *off* a RadGrid?

[Missing User]

I have a RadGrid on my page, and have the ReorderColumnsOnClient property set to true. This all works fine.

However, I also have a requirement to hide columns which are dragged *off* the grid.

Anybody have any ideas on how I might do this?

PS - I'd prefer to do this with the the regular Telerik events, as opposed to using undocumented functionality which might break on the next version.

Here's the prototype aspx I created.

<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>
<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
    <h2>
        How do I detect a column has been dragged off the grid?
    </h2>
    <asp:ScriptManager runat="server" />
    <telerik:RadGrid ID="RadGrid1" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource1"
        GridLines="None">
        <ClientSettings AllowColumnsReorder="True" ReorderColumnsOnClient="True">
        </ClientSettings>
        <MasterTableView DataKeyNames="ProductID" DataSourceID="SqlDataSource1">
            <CommandItemSettings ExportToPdfText="Export to Pdf"></CommandItemSettings>
            <RowIndicatorColumn>
                <HeaderStyle Width="20px"></HeaderStyle>
            </RowIndicatorColumn>
            <ExpandCollapseColumn>
                <HeaderStyle Width="20px"></HeaderStyle>
            </ExpandCollapseColumn>
            <Columns>
                <telerik:GridBoundColumn DataField="ProductID" DataType="System.Int32" HeaderText="ProductID"
                    ReadOnly="True" SortExpression="ProductID" UniqueName="ProductID">
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn DataField="ProductName" HeaderText="ProductName" SortExpression="ProductName"
                    UniqueName="ProductName">
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn DataField="CategoryName" HeaderText="CategoryName" SortExpression="CategoryName"
                    UniqueName="CategoryName">
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn DataField="UnitPrice" DataType="System.Decimal" HeaderText="UnitPrice"
                    SortExpression="UnitPrice" UniqueName="UnitPrice">
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn DataField="UnitsInStock" DataType="System.Int16" HeaderText="UnitsInStock"
                    SortExpression="UnitsInStock" UniqueName="UnitsInStock">
                </telerik:GridBoundColumn>
            </Columns>
        </MasterTableView>
    </telerik:RadGrid>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
        SelectCommand="SELECT [ProductID], [ProductName], [CategoryName], [UnitPrice], [UnitsInStock] FROM [Alphabetical list of products]">
    </asp:SqlDataSource>
</asp:Content>

And the web.config's 

<add name="NorthwindConnectionString" connectionString="Data Source=.;Initial Catalog=Northwind;Integrated Security=True" providerName="System.Data.SqlClient" />

[Eyup]

Hello John,

I am afraid the described behaviour is not supported since no event to handle the column drop is exposed. I know it is not the same thing,however, as an alternative to this feature I could suggest you the HeaderContextMenu:
Grid / Header Context Menu

Regards,
Eyup
the Telerik team