CanBeInstalled
status = menus.ItemAt(i)->CanBeInstalled(*this);
if (menu->CanBeInstalled(*this))
virtual status_t CanBeInstalled(const BootDrive& drive) = 0;
if (item->CanBeInstalled())
item->CanBeInstalled() && item->IsInstalled());
fWizardView->SetNextButtonEnabled(item->CanBeInstalled());
item->IsInstalled() && item->CanBeInstalled()
bool CanBeInstalled() const;
virtual status_t CanBeInstalled(const BootDrive& drive);