Jtrees and ToolTipManager

From: peepn (peepn_at_skasuj-to-poczta.fm)
Date: 03/28/04 

Date: Sun, 28 Mar 2004 13:35:50 +0200

Hello.

I have two JTrees and I want them to show ToolTips.

When I use:
        ToolTipManager.sharedInstance().registerComponent(tree1);
ToolTips are in first tree.

But when I use:
        ToolTipManager.sharedInstance().registerComponent(tree1);
        ToolTipManager.sharedInstance().registerComponent(tree2);
I got error:
Exception in thread "main" java.lang.NullPointerException

What I shoud do to have ToolTips in two JTress?

Thanks.

peepn