super();
this.xRuler = Objects.requireNonNull(xRuler);
this.yRuler = Objects.requireNonNull(yRuler);
xRulerItem = new MCheckBoxMenuItem(LangTool.INSTANCE.getStringLaTeXDrawFrame("LaTeXDrawFrame.38"), LResources.EMPTY_ICON); //$NON-NLS-1$
yRulerItem = new MCheckBoxMenuItem(LangTool.INSTANCE.getStringLaTeXDrawFrame("LaTeXDrawFrame.39"), LResources.EMPTY_ICON); //$NON-NLS-1$
unitCmItem = new MCheckBoxMenuItem(LABEL_CM);
unitInchItem = new MCheckBoxMenuItem(LABEL_INCH);
// Mapping the instrument to the widgets that produce interactions that concerns its links.
addEventable(this.xRuler);
addEventable(this.yRuler);
}