Simple problem with popup message before adding document on system form

Question

Hi all,
We have an AddOn that validates price lines on system Sales Order form matrix, so that if prices fall below a certain value, a popup is show to ask to continue or not, when user presses ADD button.
The problem is that if he chooses yes (to continue), the Sales Order is not added since the button ADD keeps being selected ....
Here is my code:
        [B1Listener(BoEventTypes.et_CLICK, true)]
        public virtual bool OnBeforeClick(ItemEvent pVal)
            int iResult = B1Connections.theAppl.MessageBox("Price lines fall bellow minimum! Continue?", 1, "NO", "YES", "");
            if (iResult == 1) // NO
                // Show error
                B1Connections.theAppl.StatusBar.SetText("OK", SAPbouiCOM.BoMessageTime.bmt_Short, SAPbouiCOM.BoStatusBarMessageType.smt_Error);
                return false;
            // YES: Continue to add Sales Order
            return true;
The problem is somehow related with the popup message being shown: if user says YES to continue, the system form does not continue with the standard process of adding the Sales Order (when I move the cursor above the ADD button is shows it already pressed...).
Do I have to do anything more to force the process to continue, when the user says YES?
Regards,
Manuel Dias

Answer 1

Thtas known problem. The solution for this is declare global variable as boolean, when user selects Yes, then set this variable to true and emulate click to add button again where before the message box check if its varaible sets to true - in this case dont show message box, only set variable to false.
The concept of code will be
dim continue as boolean = false
in item event
if continue = false then
    x = messagebox...
  if x = 1 then
    continue = true
     items.item("1").click
end if
else
continue = false
end if