code: public AT_CellContext setPaddingTopBottom(int paddingTop, int paddingBottom){
  		if(paddingTop>-1 && paddingBottom>-1){
  			this.paddingTop = paddingTop;
  			this.paddingBottom = paddingBottom;
  		}
  		return this;
  	}
docs: Sets top and bottom padding (only if both values are not smaller than 0).
  @param paddingTop new top padding, ignored if smaller than 0
  @param paddingBottom new bottom padding, ignored if smaller than 0
  @return this to allow chaining