code: public TablePanel remove(Widget widget) {
  		for (int i = 0; i < content.length; ++i)
  			for (int j = 0; j < content[i].length; ++j)
  				if (content[i][j] == widget) content[i][j] = null;
  		this.sendElement();
  		return this;
  	}
docs: Removes all elements that are instance of specified element
  
  @param widget Instance of widget to remove from container
  @return This instance for chaining