CrossHairsShowing
dynamic_cast<TWindow*>(Window())->CrossHairsShowing(&ch1Showing, &ch2Showing);
fParent->CrossHairsShowing(&ch1Showing, &ch2Showing);
CrossHairsShowing(&ch1, &ch2);
fFatBits->CrossHairsShowing(&ch1, &ch2);
fFatBits->CrossHairsShowing(&ch1, &ch2);
fFatBits->CrossHairsShowing(ch1, ch2);
void CrossHairsShowing(bool*, bool*);
void CrossHairsShowing(bool* ch1, bool* ch2);