Insert New Row - Nothing Happens

[Ledcor Development Team]

I have a GridView in a WPF page. I've got the "Click here to add new item" row to appear in the grid, but when I click anywhere in the row, nothing happens. I cannot get the new row to appear. I've got "ShowInsertRow" and "CanUserInsertRow" both set to True. Am I missing something? Is there something else I have to do to make the new line appear?

Here's my XAML for the control, Thanks for your help.:

<telerik:RadGridView Name="rgvParameters" Grid.Column="1" HorizontalAlignment="Left" Margin="134,476,0,0" VerticalAlignment="Top" Height="171" Width="496" ItemsSource="{Binding}" IsFilteringAllowed="False" ShowGroupPanel="False" AutoGenerateColumns="False" SelectionUnit="Cell" ShowInsertRow="True" ActionOnLostFocus="None" CanUserInsertRows="True" CanUserReorderColumns="False" CanUserSortGroups="False" CanUserDeleteRows="False" SelectionChanged="rgvParameters_SelectionChanged">
                        <telerik:RadGridView.Columns>
                            <telerik:GridViewDataColumn Name="rgcParameterID" DataMemberBinding="{Binding [ParameterID]}" Width="0" MaxWidth="0" MinWidth="0" />

                            <telerik:GridViewDataColumn Name="rgcApplicationID" DataMemberBinding="{Binding [ApplicationID]}" Width="0" MaxWidth="0" MinWidth="0" />
                            <telerik:GridViewDataColumn Name="rgcParameterName" DataMemberBinding="{Binding [ParameterName]}" 
                                Header="Key" />
                            <telerik:GridViewDataColumn Name="rgcParameterValue" DataMemberBinding="{Binding [ParameterValue]}"
                                Header="Value" />
                        </telerik:RadGridView.Columns>
                    </telerik:RadGridView>

Edit: One thing I just noticed. If I bring up the page and immediately click the new row, the new row line does appear. If I populate the grid with current data from the database with this line of code, the insert new row command no longer works:

rgvParameters.ItemsSource = businessRules.GetParameters(dsApp.Tables[0].Rows[0]["ApplicationID"].ToString()); 

Why does setting the ItemSource value invalidate the user's abiity to add a new record to the grid?

[Yoan]

Hi Dave,

Generally, if you want to be able to add new items you need:
1. Default (parameterless) constructor for your business object.
2. Source collection that allows insertion/ deletion.

You can check this help article for a reference.

Regards,
Yoan
Telerik

[Wilfred]

old thread but I found that when I sorted my list on ItemSource assignment, it prevented the new row from being added. Try to sort your collection prior to ItemSource assignment