User Defined Fields/ XML loading problem

hai,

1. i can able to create user defined fields , but i need my fields are in UNIUQE KEY how can i achive through the

VB Code. ?

2. I load a XML form but i cant able to make it as fixed single form, or deactivate the minimize / maximaze button , how can i achive it through the VB Code?

regards

Thiru