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Problems with dhtmlxMenubar

I'm use the context menu( dhtmlxMenubar1.3) with a tree in large page(scrolling )
When I right-click on the tree node.the contextmenu can't correct display ( menu position is incorrect)
How should solve?

P S:sorry my english is very poor :(

If context menu position shifted to some constant value, you can add correction as 

cMenu.setContextMenuPosition(x_cor,y_cor);

where x_cor and y_cor correction for x and y axis