code: public TablePanel put(Widget widget, int x, int y) {
  		if (x < 0 || y < 0 || x >= content.length || y >= content[x].length)
  			throw new IndexOutOfBoundsException();
  		attach(widget);
  		content[x][y] = widget;
  		this.sendElement();
  		return this;
  	}
docs: Set widget to certain cell in table
  
  @param widget Widget to set
  @param x      Column
  @param y      Row
  @return This instance for chaining