I cannot get my script to make my table data to create another row of data

I have my form I need to share with one of you experts... it's a very simple one... to tell me why the form isn't work the way I want it to.  Please tell me how to share the form and I will do so.

The Add detail button does not add additional rows.  The code seems correct but does not work.  Sorry for the seemingly endless rambling, but I'm in a hurry for work .  Please help where you can,  I am very willing to provide my form to whomever is willing to help me out.

Thank you in advance

Mike

My button has the following code attached to it...

xfa.form.form1.mainSF.salesSF.Table1._Details.addInstance(1);