Richtextbox on extended desktop screen

Hi Guys

I hope someone can help me.

I have a vb6 application where I have one richtextbox on form1 on my main screen

and a second richtextbox on form 2 on the extended desktop screen

The text file in both richtext boxes is the same.

When my program highlights a line of text on the richtextbox on form1, with for example:-

richetextbox.selstart = 0
richtextbox.sellenght = 100

then the text is selected ( IE highlighted )

My problem is getting the same section of text to be selected on the second richtextbox on the second form on the extended desktop screen.

I have tried:-

form2.richtextbox.selstart = form1.richtextbox.selstart
form2.richtextbox.sellenght = form1.richtextbox.sellenght

I dont get any error but the section of text on richtextbox on form2 does not highlight

Im my tests I brought up a msgbox to show the selstart and sellenght of the second richtextbox and it reports correctly 0 and 100

I also tried refreshing both the form and the richtextbox on the extended desktop screen, but still no highlight

Any Idea's

Thanks in advance for any help

Regards

David