How-to: Set properties to the child gridview

Usually, you create the gridview hierarchy by using the TableDefinition and adding it to the ChildTableDefinitions collection of RadGridView.

This article will show how to access and set different properties, in code behind, of the child gridview. Follow the steps below in order to achieve a child gridview which does not have a group panel and does not have auto-generated columns:

1. Subscribe to the DataLoading event of the parent gridview

• XAML

<telerik:RadGridView Name="employeeRadGridView"  
             ItemsSource="{Binding Employees}"  
             DataLoading="employeeRadGridView_DataLoading"> 
    <!-- ... --> 
</telerik:RadGridView> 

2. In the event handler of the DataLoading event check the ParentRow property of the sender object:

• C#
• VB.NET

private void employeeRadGridView_DataLoading(object sender, GridViewDataLoadingEventArgs e) 
{ 
    GridViewDataControl dataControl = (GridViewDataControl)sender; 
    if (dataControl.ParentRow != null) 
    { 
        //dataControl is the child gridview 
        dataControl.ShowGroupPanel = false; 
        GridViewDataColumn column = new GridViewDataColumn(); 
        column.DataMemberBinding = new Binding("EmployeeID"); 
        dataControl.Columns.Add(column); 
        column = new GridViewDataColumn(); 
        column.DataMemberBinding = new Binding("FirstName"); 
        dataControl.Columns.Add(column); 
        column = new GridViewDataColumn(); 
        column.DataMemberBinding = new Binding("LastName"); 
        dataControl.Columns.Add(column); 
        column = new GridViewDataColumn(); 
        column.DataMemberBinding = new Binding("Title"); 
        dataControl.Columns.Add(column); 
    } 
} 

Private Sub employeeRadGridView_DataLoading(sender As Object, e As GridViewDataLoadingEventArgs) 
    Dim dataControl As GridViewDataControl = DirectCast(sender, GridViewDataControl) 
    If dataControl.ParentRow IsNot Nothing Then 
        'dataControl is the child gridview 
        dataControl.ShowGroupPanel = False 
        Dim column As New GridViewDataColumn() 
        column.DataMemberBinding = New Binding("EmployeeID") 
        dataControl.Columns.Add(column) 
        column = New GridViewDataColumn() 
        column.DataMemberBinding = New Binding("FirstName") 
        dataControl.Columns.Add(column) 
        column = New GridViewDataColumn() 
        column.DataMemberBinding = New Binding("LastName") 
        dataControl.Columns.Add(column) 
        column = New GridViewDataColumn() 
        column.DataMemberBinding = New Binding("Title") 
        dataControl.Columns.Add(column) 
    End If 
End Sub 

As an alternative, you can use the HierarchyChildTemplate and put RadGridView in its DataTemplate - this way you can set the properties directly to the gridview:

• XAML

<telerik:RadGridView Name="gridView" ItemsSource="{Binding Person}"> 
    <telerik:RadGridView.ChildTableDefinitions> 
        <telerik:GridViewTableDefinition /> 
    </telerik:RadGridView.ChildTableDefinitions> 
    <telerik:RadGridView.HierarchyChildTemplate> 
        <DataTemplate> 
            <telerik:RadGridView ItemsSource="{Binding Children}" Name="childGrid" ShowGroupPanel="False" /> 
        </DataTemplate> 
    </telerik:RadGridView.HierarchyChildTemplate> 
</telerik:RadGridView>