this.yTop = yTop + this.marginTop; this.yBottom = yBottom - this.marginBottom;
this.yTop = yTop + this.marginTop + this.paddingTop; this.yBottom = yBottom - (this.marginBottom + this.paddingBottom);
	public void setVerticalDimensions( int yTop, int yBottom ) {		this.yTop = yTop + this.marginTop;		this.yBottom = yBottom - this.marginBottom;		this.enableScrolling = (yTop != -1 || yBottom != -1 );	}