SetActionEnabled
void SetActionEnabled(uint32 command, bool enabled);
fToolBar->SetActionEnabled(MSG_PREVIOUS_SCREENSHOT,
fToolBar->SetActionEnabled(MSG_NEXT_SCREENSHOT,
fToolBar->SetActionEnabled(M_SAVE_AS_DRAFT, fFieldState);
fToolBar->SetActionEnabled(M_PRINT, fFieldState);
fToolBar->SetActionEnabled(M_SEND_NOW, (fFieldState & FIELD_TO)
fToolBar->SetActionEnabled(M_SAVE_AS_DRAFT, false);
fToolBar->SetActionEnabled(M_PRINT, fFieldState);
fToolBar->SetActionEnabled(M_SEND_NOW, (fFieldState & FIELD_TO)
fToolBar->SetActionEnabled(M_SAVE_AS_DRAFT, false);
fToolBar->SetActionEnabled(M_SEND_NOW, false);
fToolBar->SetActionEnabled(M_SAVE_AS_DRAFT, false);
fToolBar->SetActionEnabled(M_PRINT, false);
fToolBar->SetActionEnabled(M_NEXTMSG, false);
fToolBar->SetActionEnabled(M_PREVMSG, false);
fToolBar->SetActionEnabled(what, enable);
SetActionEnabled(kNavigatorCommandForward, false);
SetActionEnabled(kNavigatorCommandUp, false);
SetActionEnabled(kNavigatorCommandUp, enable);
SetActionEnabled(kNavigatorCommandForward, fForwHistory.CountItems() > 0);
SetActionEnabled(kNavigatorCommandBackward, fBackHistory.CountItems() > 1);
SetActionEnabled(kNavigatorCommandBackward, false);