Hi all,
I made an easy to use scrollable panel function. 
There is one significant change from the methodology used above. That is the use of maximumSize, without using this the size of the inner panel is limited to the size of the screen.
Enjoy,
Trevor
// By Trevor http://forums.adobe.com/thread/1229123?tstart=0
function addScrollablePanel (toTheParent, locationX, locationY, outerPanelWidth, outerPanelHeight, innerPanelWidth /* leave blank if not scrolling horizontally*/, innerPanelHeight /* leave blank if not scrolling vertically*/, barThickness /* optional */) { var padding = 2, innerPanel, outerPanel, scrollbarH, scrollbarV; innerPanelWidth || innerPanelWidth = outerPanelWidth; // if the optinal variables are not defined then define them innerPanelHeight || innerPanelHeight = outerPanelHeight; barThickness || barThickness = 15; innerPanelWidth += padding; innerPanelHeight += padding; scrollbarH = (innerPanelWidth != outerPanelWidth + padding); scrollbarV = (innerPanelHeight != outerPanelHeight + padding); if ($.os.match(/Windows/i)) { scrollbarV && scrollbarV = toTheParent.add('scrollbar', [locationX + outerPanelWidth - barThickness - padding, locationY + padding , locationX + outerPanelWidth - padding, locationY + outerPanelHeight - padding - (scrollbarH && barThickness)]); scrollbarH && scrollbarH = toTheParent.add('scrollbar', [locationX + padding, locationY + outerPanelHeight - padding -barThickness, locationX + outerPanelWidth - padding - (scrollbarV && barThickness), locationY + outerPanelHeight - padding]); scrollbarH && scrollbarV && toTheParent.add('statictext', [locationX + outerPanelWidth - barThickness - padding , locationY + outerPanelHeight - barThickness - padding, locationX + outerPanelWidth - padding, locationY + outerPanelHeight - padding]); // fill the gap between the scrollbarbuttons outerPanel = toTheParent.add('panel',[locationX, locationY, locationX + outerPanelWidth, locationY + outerPanelHeight]); } else// Mac { outerPanel = toTheParent.add('panel',[locationX, locationY, locationX + outerPanelWidth, locationY + outerPanelHeight]); scrollbarV && scrollbarV = toTheParent.add('scrollbar', [locationX + outerPanelWidth - barThickness - padding, locationY + padding , locationX + outerPanelWidth - padding, locationY + outerPanelHeight - padding - (scrollbarH && barThickness)]); scrollbarH && scrollbarH = toTheParent.add('scrollbar', [locationX + padding, locationY + outerPanelHeight - padding , locationX + outerPanelWidth - padding - (scrollbarV && barThickness), locationY + outerPanelHeight - padding - barThickness]); scrollbarH && scrollbarV && toTheParent.add('statictext', [locationX + outerPanelWidth - barThickness - padding , locationY + outerPanelHeight - barThickness - padding, locationX + outerPanelWidth - padding, locationY + outerPanelHeight - padding]); } innerPanel = outerPanel.add('panel'); // set the bounds after setting the maximumSize innerPanel.maximumSize = [innerPanelWidth * 2, innerPanelHeight * 2]; // This needs to be set to at lest the required size otherwise the panel size is limmited to the screen size innerPanel.bounds = [0, 0, innerPanelWidth, innerPanelHeight]; // now we can set the size :-) scrollbarV && scrollbarV.jumpdelta = 100 * outerPanelHeight / innerPanelHeight; // Make size of bar whatdoyoucallit (drag thing) propotional to the size of the windows scrollbarH && scrollbarH.jumpdelta = 100 * outerPanelWidth / innerPanelWidth; // Make size of bar whatdoyoucallit (drag thing) propotional to the size of the windows scrollbarV && scrollbarV.onChanging = function () {innerPanel.location.y = scrollbarV.value*(outerPanelHeight)/100 - scrollbarV.value*(innerPanelHeight)/100 - padding *(1-scrollbarV.value/100) }; scrollbarH && scrollbarH.onChanging = function () {innerPanel.location.x = scrollbarH.value*(outerPanelWidth)/100 - scrollbarH.value*(innerPanelWidth)/100 - padding *(1-scrollbarH.value/100) }; innerPanel.location.x -= padding; innerPanel.location.y -= padding; return innerPanel;}
function hiJareck (toTheParent, accross, down, n, nn) { accross || accross = 1; down || down = 1; /* if (!accross >1) accross = 1; if (!down >1) down = 1;*/ for (n = 0; n < down; n++) for (nn = 0; nn < accross; nn++) toTheParent.add('edittext',[20+nn * 140,15+n*30, 130 + nn * 140 ,35+n*30], "Hi Jareck #"+ (n+1) + " #" + (nn+1) ); } /* ****************** USAGE ********************* */
var w = new Window ("dialog","My Horizontally Scrollable Panel",[100, 100, 900 , 600]);
horizontalScrollablePanel = addScrollablePanel (w, 20, 20, 250, 70, 3700, false, 20);
horizontalScrollablePanel2 = addScrollablePanel (w, 20, 100, 250, 70, 1000, false, 20);
verticalScrollablePanel = addScrollablePanel (w, 300, 20, 200, 150, false, 1000, 20);
verticalScrollablePanel2 = addScrollablePanel (w, 510, 20, 200, 150, false, 1000, 40);
vertAndHorzScrollablePanel = addScrollablePanel (w, 250, 190, 310, 210, 3520, 820);
hiJareck(horizontalScrollablePanel, 26, 1);
hiJareck(horizontalScrollablePanel2, 7, 1);
hiJareck(verticalScrollablePanel, 1, 30);
hiJareck(verticalScrollablePanel2, 1, 30);
hiJareck(vertAndHorzScrollablePanel, 25, 25);
w.show();