public static int IndexOfChildWithName(
	LayoutElement parent,
	string name
)

Public Shared Function IndexOfChildWithName ( 
	parent As LayoutElement,
	name As String
) As Integer

void DetailSection_ItemDataBinding_Using_IndexOfChildWithName_And_GetChildByIndex(object sender, EventArgs e)
{
    Processing.DetailSection processingInstance = (Processing.DetailSection)sender;
    int index = Processing.ElementTreeHelper.IndexOfChildWithName(processingInstance, "textBox1");
    if (index >= 0)
    {
        Processing.LayoutElement child = Processing.ElementTreeHelper.GetChildByIndex(processingInstance, index);
        Processing.VisualElement visualChild = child as Processing.VisualElement;
        if (null != visualChild)
        {
            visualChild.Style.BackgroundColor = System.Drawing.Color.Blue;
        }
    }
}

Private Sub DetailSection_ItemDataBinding_Using_IndexOfChildWithName_And_GetChildByIndex(sender As Object, e As EventArgs)
    Dim processingInstance As Processing.DetailSection = DirectCast(sender, Processing.DetailSection)
    Dim index As Integer = Processing.ElementTreeHelper.IndexOfChildWithName(processingInstance, "textBox1")
    If index >= 0 Then
        Dim child As Processing.LayoutElement = Processing.ElementTreeHelper.GetChildByIndex(processingInstance, index)
        Dim visualChild As Processing.VisualElement = TryCast(child, Processing.VisualElement)
        If visualChild IsNot Nothing Then
            visualChild.Style.BackgroundColor = System.Drawing.Color.Blue
        End If
    End If
End Sub