I am having a problem where cells in a XamMultiColumnComboEditor are not rendering properly (see 1st pic).  If I resize the control, the data will appear (see 2nd pic).  If the user toggles between two radio buttons, the item source for the XamMultiColumnComboEditor is changed.  I'm at a loss on what could possibly be wrong and how to fix it.

<ig:XamMultiColumnComboEditor Grid.Row="5" Grid.Column="1" Grid.ColumnSpan="2" Grid.RowSpan="1" Margin="4"
x:Name="xamMultiColumnComboEditorTicket" VerticalContentAlignment="Center"
AutoGenerateColumns="False" DropDownButtonDisplayMode="Always" SelectedItemsResetButtonVisibility="Collapsed">
<ig:XamMultiColumnComboEditor.Columns>
<ig:TextComboColumn Key="TicketNumber" Width="25*" HeaderText="Ticket"/>
<ig:DateComboColumn Key="EffectiveDate" Width="25*" HeaderText="Effective Date" />
<ig:TextComboColumn Key="Chain" Width="10*" HeaderText="Chain"/>
<ig:TextComboColumn Key="Store" Width="25*" HeaderText="Store"/>
<ig:TextComboColumn Key="TransactionCode" Width="10*" HeaderText="Transaction Code"/>
<ig:TextComboColumn Key="TicketValue" Width="25*" HeaderText="Ticket Value" />
<ig:TextComboColumn Key="RouteNumber" Width="10*" HeaderText="Route"/>
</ig:XamMultiColumnComboEditor.Columns>
</ig:XamMultiColumnComboEditor>

var ticketList = new List<Ticket>();


                if (button.Name == "radioFreeTickets")
                {
                    // Select only free tickets
                    ticketList = Tickets.Where(t => t.RouteNumber == route.RouteNumber && t.Free).ToList();
                }
                else
                {
                    ticketList = Tickets.Where(t => t.RouteNumber == route.RouteNumber).ToList();
                }

                this.xamMultiColumnComboEditorTicket.ItemsSource = ticketList;