I found what was causing the problem. It is binding to checkbox on the form. I don't know why though, just simply by commenting the call to binding the checkbox, the problem goes away. I will start a new thread on how to get around the problem with check box binding.
"The creative process is nothing but a series of crises." Isaac Bashevis Singer
"My experience is that as soon as people are old enough to know better, they don't know anything at all." Oscar Wilde
"If a nation values anything more than freedom, it will lose its freedom; and the irony of it is that if it is comfort or money that it values more, it will lose that too." W.Somerset Maugham