Variable from table usage

[#1]

I want to receive an variale from user, using this script:

dt = current data table();
r=ColumnDialog(
XL=ColList("X Axis Value");
);

After chosing in the popup window one of the options (for example "TestType"),
I receive the result - {XL = {TestType}, Button( 1 )}

But I don't know how to use the "TestType" in the script,
tried:
show(char(XL))
show(char(XL[1]))
XL[1,1]
and many others...

[#2]

Fond it:

result = r["XL"];