Scrollpane component

I am working on the “Scrolling Dynamically Loaded Text” tutorial and i have gotten to the part were you drag the Scrollbar Component from the component window… I am using MX2k4 and the component is not there just the scrollpane component… when i drag this onto the text box as instrucked it does not snap as the tutorial sayes it should but rather make a box and truns the tex box into a dotted line box … please help what am i doing wrong