Adjustments - multiple connections, control $page_size, etc.

[Kevin Horton <khorton01 rogers com>]

I'm a gtk2-perl newbie, trying to create an application to display  
some data plots.  I'll be using an experimental set of bindings to  
the GtkDataBox widget.  Scott (a.k.a muppet), who created the  
GtkDataBox bindings has helped me quite a bit with them, but I've got  
some more general questions that I shouldn't bother him with.

I'll be displaying a dozen or more GtkDataBox widgets, and control  
the portion of data that is displayed by having three SpinButtons to  
control the X-axis adjustments of the GtkDataBox widgets.  The X-axis  
on all the GtkDataBox widgets must remain identical.  I have three  
questions:

1. How would I control the $page_size part of an adjustment using a  
SpinButton?  The default is to control the $value.

2. How would I have a SpinButton affect both the $value and  
$page_size when the user twiddles the SpinButton?  I am trying to  
have a way for the user to change the left edge of the displayed data  
range, while leaving the right edge unchanged.  The adjustment $value  
sets the left edge, and the right edge is equal to $value + $  
page_size.  Thus I need to have SpinButton input affect both $value  
and $page_size.

3. How would I connect one SpinButton to multiple widgets?  I need to  
keep the X-axis on all widgets locked together, with just one set of  
SpinButtons that controls all widgets.

I dug through all the docs I can find, and did a lot of Googling.    
But I either haven't found the info I need, or if I did, I don't know  
enough to recognize it.

Thanks in advance,

Kevin Horton
Ottawa, Canada