>>>Now I have another problem - Form a calls form b - form b in turn calls form c - form c flashes and disappears - when I close form b I can see form a and c
>>>
>>>What have I done wrong
>>
>>It depends on how do you call these forms and are they modal or modeless. For the modeless form the behavior you describe is common.
>
>I call the form with do blackberrycollection - this form is modal as are all my other forms

Modal form calling another modal form may lead to some strange effects, I think. Anyway, try tracing the problem setting breakpoints in form's Init method.