Returns true if the control is marked as hidden, otherwise returns false. This method only returns true if
this specific control has been marked as hidden, and does not check if the control is hidden because one of its parents has been
marked as hidden. Use method #isShowing() to check whether the control will be included in the web page displayed to the user.
trueif the control is marked as hidden, otherwise returnsfalse. This method only returns true if this specific control has been marked as hidden, and does not check if the control is hidden because one of its parents has been marked as hidden. Use method #isShowing() to check whether the control will be included in the web page displayed to the user.