code: public AT_CellContext setPadding(int padding){
  		if(padding>-1){
  			this.paddingTop = padding;
  			this.paddingBottom = padding;
  			this.paddingLeft = padding;
  			this.paddingRight = padding;
  		}
  		return this;
  	}
docs: Sets all padding to the same value.
  @param padding new padding for top, bottom, left, and right, ignored if smaller than 0
  @return this to allow chaining