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A RadCombobox event SelectedIndexChanged fires when the control is problematically checked with exactly one checkbox item

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This is a migrated thread and some comments may be shown as answers.
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NW7US asked on 08 Aug 2012, 12:11 PM
(The title of this thread is not quite accurate.  The title should be: "A RadComboBox event SelectedIndexChanged fires when the control is programmatically checked with exactly one checkbox item")

I have a RadComboBox that contains CheckBox items.  I programmatically set certain items as Checked, if data exists in a database table.  Here is a segment of code:

Dim idr As Data.DataRow
Dim ids As Data.DataSet
Dim idt As Data.DataTable
Dim idtData As New Data.DataSet
Dim iParameters(0 To 0) As Data.SqlClient.SqlParameter
iParameters(0) = New Data.SqlClient.SqlParameter("@intBIDOID", CheckDBNull(CInt(BIDOID), enumObjectType.IntType))
ids = clsEPD_DATA.StoredGetDataset("spGetBidsSystemTypeNames", iParameters)
If ids.Tables(0).Rows.Count >= 1 Then
    idt = ids.Tables(0)
    For Each idr In idt.Rows
        ' "BUG" - when one and ONLY one item is check-marked, here, it causes the control to
        ' be in a state as if SelectedIndex has been changed (Telerik states this is expected).
        ' And, it stays that way, even though we set it here, and the user did NOT change anything.
        ' This is a "bug" in our scenario, where I must determine if the USER DID THE CHANGE,
        ' not the program.
        Dim cboSTObject As RadComboBoxItem = cboSystemType.FindItemByValue(CheckDBNull(idr("SYSTOID"), enumObjectType.IntType))
        cboSTObject.Checked = True
End If
'------------ end of System Type checkboxed combobox ----------------------

Here is the aspx snippet:

<telerik:RadComboBox ID="cboSystemType" runat="server" Width="200px"
EmptyMessage="Select the System Type (if any):"
Height="250px" DataTextField="ST_Name" DataValueField="SYSTOID"
DataSourceID="SqlDataSource5" TabIndex="8" CheckBoxes="True"
<asp:SqlDataSource ID="SqlDataSource5" runat="server" ConnectionString="<%$ ConnectionStrings:EPD_DATAConnectionString %>"
SelectCommand="spGetBidSystemTypeNames" SelectCommandType="StoredProcedure">

What I would like to do is create code such that when my programmatic method changes the index (which appears only to occur when only ONE items is check-marked, but never when zero, or two or more, items are check-marked by the program), that I can somehow set the SelectedIndex code to ignore it, but when the USER MAKES A CHANGE, then I pay attention to it.  Should I create an internal variable "flag" in my program to somehow watch for when I make changes programmatically, but clear the flag?  This seems clunky.

Any guidance would be appreciated.  Thank you.

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Telerik team
answered on 10 Aug 2012, 01:23 PM

If you use the RadComboBox Checkboxes feature - in general there is no "selected" item in the control.
Instead of this there are CheckedItems – a collection populated with the checked items.

When the user checks/unchecks a checkbox - the ItemChecked event fires, please handle this event instead of SelectedIndexChanged.

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