XML Data to RichTextBox

Question

I've got an XML file loading into a treeview, however, i want to be able to load content from the XML file into 3 RTB's when i click on that node.

XML File example:

<node>
<RTB1>text</RTB1>
<RTB2>text</RTB2>
<RTB3>text</RTB3>
</node>

i've had no luck finding an example