GUI Tracker Question

Hello.
I have a question about a tracker in GUI.
In my GUI, I put a tracker and a text box together in a panel.
Currently, I made the tracker to assign some value (which the bar indicates) to a global variable.
I set the minimum value of a tracker as 0 and maximum as 1.
Also, I made the text box show the assigned value of a global variable.
The problem I face with is that after I close GUI and reopen it,
the text box shows the value of a global variable,
but the tracker does not show the value of a global variable.
The tracker just indicates the minimum value every time I reopen the GUI.
Is there anyway to make the tracker to indicate the value of a global variable like the text box?
Thank you.

Assign the value to a node in hotlinkx, and then just return the node.

eg:
treenode valuenode=node(">value",c); // add 'value' at the same level as the hotlinkx
set(valuenode,<globalvariable>);
return valuenode;