function removeTabbable(oBlockSpan, fnRedirectFocus) {
			if (oBlockSpan.parentNode) {
				oBlockSpan.parentNode.removeChild(oBlockSpan);
			}
			oBlockSpan.removeEventListener('focusin', fnRedirectFocus);
		}
Create a tabbable span for the block section of the control with according focus handling.

@param {object} oBlockSpan The span element's DOM node
@param {function} fnRedirectFocus Focus handling function
@private