How to call a new Form from a UniFrame?

[55143681]

In my Main Page,I call a UniFrame whose parent is a UniTabSheet,

In the new UniFrame,I want to click a button to call a free form,

but I have an error where I build the project,

can I call a new free form from a UniFrame?

void __fastcall TUniFrame2::UniDBGrid1ColumnActionClick(TUniDBGridColumn *Column,
          int ButtonId)
{
switch (ButtonId)
    {
    case 1:
        {

//Here is the error
        TUniFormRoleFunc *newForm=new TUniFormRoleFunc(UniApplication);
        newForm->ShowModal();
        break;
        }

    default:
        {

        }
    }

}