My datagrid refuses to scroll (newbie)

Question

While working on a AIR project, I have created a several datagrids which will not scroll vertically. When the dataprovider is a hard-coded array, they work, but then when I bind to an array that results from a SQLLite SELECT statement, the data is displayed just fine, but the datagrid won't scroll beyond the visible rows.
When I drag the scrollbar handle down, it pops back up to the top as soon as I release the mouse button. If I hold the mouse button down on the bottom scroll bar arrow, it flickers (it scrolls down a row and pops back up to the top within a few milliseconds). If I position the mouse pointer inside the list and flick the mouse scroll wheel very quickly, it will scroll down a few rows. As soon as I move the mouse pointer over the scroll bar, the list goes back to the top again.
Has anybody seen this kind of behavior before?
Code for datagrid and the panel that contains it:
<s:Panel x="483" y="372"     width="
200" height="238"     title="
Commonly Used Buyer(s)"     fontSize="
14">
     <mx:DataGrid x="10" y="15"          dataProvider="
{buyerCollection}"          fontSize="
12" fontWeight="bold"          width="
178" height="100">
          <mx:columns>
               <mx:DataGridColumn headerText="Buyer Name" dataField="BUYE_NAME"/>
          </mx:columns>
     </mx:DataGrid>
</s:Panel>

Answer 1

I figured it out!
The problem was caused by me calling the data retrieval functions from the render event of a component. I did this because the component is only visible when the user switches to a certain application state. The component contains many datagrids and other bound controls, so I didn't want to retrieve data into its controls unless the user chose to switch to that state. Unfortunately, it seems that the render event fires over and over again. In fact, I suspect that it re-fired whenever data was displayed in the controls, so an endless loop was occurring.
I have moved the retrieval logic to the application itself. This solved my datagrid scrolling problem. Unfortunately, this adds overhead and prevents me from achieving my original goal of loading the data only when the state is changed.
If anyone has a suggestion for a good way to load data on state change, I would be interested. I suppose that I could put back it on the render event and set a "dataLoaded" flag variable to true after loading. On the render event, I would only load the data if the variable was false. I'm sure there's a better event or technique out there.
Many thanks to all those who responded. The suggestions that an event was firing repeatedly certainly pointed me in the right direction!