highlighting selected text in RichTextBox

[Charlie]

I have the following code but I can't get the selected text to
highlight correctly. What happens is all the text after the selected
text is red. I need to add that after the selected text is
highlighted, I append more text to the box (I'm working through an xml
doc & highlight based on attributes as I go along).
Any help appreciated. thanks...charli e

int indx = richTextBox1->Text->IndexOf(theTex t->InnerText);
if (indx != -1) {
// Select the string using the index and the length of the string.
richTextBox1->Select(indx, theText->InnerText->Length); // length
is 5 in text
richTextBox1->set_SelectionC olor(System::Dr awing::Color::R ed);
}