Hi Steve

Thanks for the reply.  I've made a little headway but still have a ways to go.  I'll see if I can clarify what I'm trying to do.  I've gotten the checkbox to appear as I want using this template:

                                <igDataGrid:TextColumn Key="Event_Type" HeaderText="Category">
                                    <igDataGrid:TextColumn.GroupByItemTemplate >
                                         <DataTemplate x:Name="GroupTemplate">
                                            <StackPanel Orientation="Horizontal">
                                                <CheckBox x:Name="GroupCheck" IsChecked="True"/>
                                                <TextBlock Text="{Binding Value}"></TextBlock>
                                                <TextBlock Text=" (" />
                                                <TextBlock Text="{Binding Count}"></TextBlock>
                                                <TextBlock Text=")" />
                                            </StackPanel>
                                        </DataTemplate>
                                    </igDataGrid:TextColumn.GroupByItemTemplate>
                                </igDataGrid:TextColumn>

Now the next step is to hook up the checkbox "checked" event to an event handler.  In the handler I want to loop through each of the rows in the group.  In this case to turn off a point on a map.  So I guess my current questions are:

1.  How do I hook an event handler to the checkbox checked event in code?  I'm not sure how to reference the checkbox to set the handler.

2.  There are several columns in the grid that will have the same groupbyitemtemplate.  Can I name all the checkboxes the same, in this case "GroupCheck" and use one event handler to deal with them all?

3. How do I reference (loop through) the group in the event handler?

Thanks and really appreciate you help.

Gregg

Hey Gregg, 

1.  Just add the event handlers in xaml. 

2. You can use the sender parameter of the event to get the checkbox. And thus you can use one event handler. 

3. Just set the Tag of the CheckBox to identify it in the event. If you use one data template, you can simply just bind to the GroupByDataContext:

Now one thing to keep in mind, is that you'll want to make sure that you store whether the check box is checked somewhere, otherwise it will get lost due to virtualization.  You can do this with a binding a ValueConverter on the IsChecked property. 

<CheckBox Checked="CheckBox_Checked"  Unchecked="CheckBox_Unchecked" IsChecked="{Binding Value, Converter={StaticResource mvc}}" Tag="{Binding}"></CheckBox>

<UserControl.Resources>

<local:MyValueConverter x:Key="mvc"/>

</UserControl.Resources>

            MyValueConverter _mvc;

public Page2()

            {

                  InitializeComponent();

                  this._mvc = this.Resources["mvc"] as MyValueConverter;   

            }

private void CheckBox_Checked(object sender, RoutedEventArgs e)

            {

                  CheckBox cb = (CheckBox)sender;

                  GroupByDataContext gbdc = cb.Tag as GroupByDataContext;

                  if (gbdc != null)

                        this._mvc.UpdateValue(gbdc.Value, cb.IsChecked);

                  // Update Map

            }

            private void CheckBox_Unchecked(object sender, RoutedEventArgs e)

            {

                  CheckBox cb = (CheckBox)sender;

                  GroupByDataContext gbdc = cb.Tag as GroupByDataContext;

                  if(gbdc != null)

                        this._mvc.UpdateValue(gbdc.Value, cb.IsChecked);

                  // Update Map

            }

Hope this helps, 

-SteveZ

Hi Steve

Again, thanks for the reply.  I have a need to add in the event handler through code as opposed to XAML and I can't seem to figure it out.  Here is the significant part of the XAML:

                        <igDataGrid:XamWebGrid x:Name="EventsGrid"   Foreground="DarkBlue"  FontSize="10" Background="WhiteSmoke"  VerticalAlignment="Top" HorizontalAlignment="Left" Opacity="0.85" >

                           <igDataGrid:XamWebGrid.Columns>

                                <igDataGrid:TextColumn Key="event_id" HeaderText="Event ID"/>
                                
                                <igDataGrid:TextColumn Key="Event_Type" HeaderText="Category" x:Name="EventColumn">
                                    <igDataGrid:TextColumn.GroupByItemTemplate >
                                         <DataTemplate x:Name="MyGroupTemplate">
                                            <StackPanel Orientation="Horizontal">
                                                <CheckBox x:Name="GroupCheck" IsChecked="True" />
                                                <TextBlock Text="{Binding Value}"></TextBlock>
                                                <TextBlock Text=" (" />
                                                <TextBlock Text="{Binding Count}"></TextBlock>
                                                <TextBlock Text=")" />
                                            </StackPanel>
                                        </DataTemplate>
                                    </igDataGrid:TextColumn.GroupByItemTemplate>
                                </igDataGrid:TextColumn>

                            </igDataGrid:XamWebGrid.Columns>

                        </igDataGrid:XamWebGrid>

I need an addhandler statement like this one but I can't quite figure out how to reference the checkbox in the GroupByItemTemplate.

 AddHandler DataWindow.EventsGrid.SelectedRowsCollectionChanged, AddressOf EventSelected

I appreciate the help.  Gregg

Hi Gregg,

Just setting Tag="{Binding}" should do the trick.

Hope that helps,

Hi Steve

One last question (I hope).  How do I bind the GroupByDataContext to the tag?  Can't quite seem to get the syntax right.

Thanks, Gregg

Hi Steve

Thanks again for your help.  I believe I have found the error of my ways and was able to use the data template to handle the event.

Thanks again, Gregg

Hi Gregg, 

There currently isn't an event that fires when a control is attached to GroupByCell.

Out of curiosity, why do you need to add the eventhandler in code, as opposed through the data template?

-SteveZ