How to modifying variable of the radio button for keyword test?

When I do as the help file to create a Date-Driven Testing With Keyword tests-Tutorial.but in the step5 Modifying the MasterCard.ClickButton Operation.  ->Right-click within the Temporary section of the page and choose New Item from the context menu. TestComplete will add a new row to the Variables table.    The result is there are 2 rows of variable values in he variabke table. but in the demo program, there is only 1 row in the variable table.        And I can not do the step of "In the dialog, select the Project Variable radio button and choose the previously created RadioButtonName variable from the Project Variable Name list." in this step, I can not find the RadioButtonName variable. Where is my wrong.