I ran into a problem that I’m still not sure what was happening today.
I had something like this:

public class MyHeader extends Canvas
{
…
}

…

myDataGridColumn.headerRenderer = new ClassFactory( MyHeader );

It worked, but upon mouse over or mouse move it would flicker like
crazy. Extending Label or Button works no problem. I tried
implementing various interfaces like IDataRenderer,
IDropInListItemRenderer, and IListItemRenderer but still had the same
results.

A quick fix I found was to intercept and cancel those mouse events in
my header class.

addEventListener(MouseEvent.MOUSE_OVER, onMouseOver, true );
addEventListener(MouseEvent.MOUSE_MOVE, onMouseOver, true );
…
protected function onMouseOver(event:MouseEvent) : void
{
event.preventDefault();
}

Now everything seems to work fine. But I’m still at a loss on why this
happened in the first place and I worry my hack of a fix is the wrong
way to do it. Has anyone successfully gotten a custom header renderer
based on a container working?


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