PB7 -> Check Box Third State

I am trying to work with making a check box a halfchecked check.  By
doing this I need to use the ThirdState Property.  The way I have it
set up is 0=off, 1=on, and 2=halfchecked.  It works currently by going

0->2->1->0->2->1...order but I want it to go from 0->1, 1->2, and 2->1
only never 0->2 and 2->0.  Any ideas or suggestions on where to look?

I have tried to hard code it the way I want by doing the below chunk in
the itemchanged event of the dw:
lv_s_column_name = dwo.name
lv_s_original = this.getitemstring(row, lv_s_column_name)
//Change the data to be the correct value.  The way PB did it was
0->2->1->0->1->2....  We
//need it to go from 0->1, 1->2, 2->1 only.
//0=blank; 1=yes; 2=previously checked
IF lv_s_original = "0" then
data = "1"
elseif lv_s_original = "1" then
data = "2"
elseif lv_s_original = "2" then
data = "1"
end if
this.setitem(row, "pub_ind", data)