Hello Naomi

Like i said , i need your help.
I create the new method
i place the following code on form in procedure INIT and UpdateTotals

on INIT

Public insere
insere=0
THISFORM.PROCVAL.Value = 0.00

local lnTotal as Double
Intotal = 0
select ccheques
sum valor to lnTotal for thisform.Grid1.column1.Check1 = .T.
thisform.total.value = m.lnTotal

on updatetotals
local lnTotal as Double
LnTotal = 0
select ccheques
sum valor to lnTotal for thisform.Grid1.column1.Check1 = .T.
thisform.total.value = m.lnTotal

on the column grid checkbox who as named check1, i place this code :
Procedure Click

this.value = this.value
thisform.UpdateTotals()

I put thisform.Grid1.column1.Check1 = .T., because without .T. VFP return error, but in this moment i have the following error :

error nº 107
message : Operator / Operand type mismatch

Line error nº : 8
Program/function : FORM1.INIT
Line of Code : _VFP.AutoYield = .F.

Sorry, can you help me

thanks
Luis Santos