if (mwxsphereview) { delete mwxsphereview; }
if (mwxvtkmpr3Dview) { delete mwxvtkmpr3Dview; }
if (mwxvtkclipping3Dview) { delete mwxvtkclipping3Dview; }
if (mwxsphereview) { delete mwxsphereview; }
if (mwxvtkmpr3Dview) { delete mwxvtkmpr3Dview; }
if (mwxvtkclipping3Dview) { delete mwxvtkclipping3Dview; }