Textobject and numbers


I am trying to add a textobject from the command line with the the following script
-_textobject Texttest 0,0;
It works well with text but it seems not to work when I substitute Texttest with a number like
-_textobject 10 -0,0;

I wish I could avoid to use the textobject popup box

Thanks for your help


-_TextObject "10" 0,0,0 (enclose the number string in quotes)