>>>>>>Do you want to say that you have the same buttons (to open new form) on both pages?
>>>>>No, I use two different buttons. Also, When I close the form, the code is...
>>>>>myform.hide
>>>>
>>>>How do you close your form? Is it modal or modeless form?
>>>I close use this code..
>>>thisformset.myform.hide and the form is modal.
>>
>>From where you fire this code?
>From a command button's click event on the form that is being closed.

Is it consistent problem? What's happened if you close the form manually clicking on form's right-upper corner? BTW, when you open form you use Form.Show or something else?