Encountring weird problem with BUTTON, PLEASE help -

Hello,

I am in a middle of one program and encountring an strange problem with a BUTTON control.

If you RUN the program, the first FORM will appear with only one button. Click on the button and a POP UP will appear with today's date click on the button labeled CONTINUE. Now on this new form you will see a button labeled ADD NEW. Click on the button and another pop up will appear. Now in the LAST NAME field type MOH and click on search and only one record will show up. Double click on the record and detail of that record will appear in another form as a pop up. Here just click on SELECT button. The form that had the ADD NEW button will re-appear with some change. The form will have some data at the bottom and the focus will be set to the TEXT BOX labeled Code.

Now the problem starts here. The ADD NEW button becomes TOTALLY DEAD. If you set the focus on any other BUTTON or even on the DTPICKER or the two OPTIONS the ADD NEW button works fine. But if you click on the TEXT BOX and the cursor is there in the text box then again the ADD NEW button goes DEAD. I cannot figure out this problem.

Please HELP.