if (myPreviewIsDisplayed) {
XGUI_Displayer* aDisp = XGUI_Tools::workshop(theWorkshop)->displayer();
aDisp->eraseAIS(myPlane, false);
if (myPreviewIsDisplayed) {
XGUI_Displayer* aDisp = XGUI_Tools::workshop(theWorkshop)->displayer();
aDisp->eraseAIS(myPlane, false);