Thx for your response a lot:

I try all, for example:

void __fastcall TformularioMapa::FormActivate(TObject *Sender)
{

this->BringToFront();
mainForm->SendToBack();
}

dont work, when i click in the secundary form, it go front and inmediatly the main go front of all again :S.

Maybe if i control the mappoint event i could fix all, zoom map and window problem, but i was looking for mappoints events control in c++ and i dont find any code, all in delphy or VB.