[Gtk-sharp-list] position of a combobox

[Kimet Adil]

Hi,

I am trying to find the position od a comboboxentry on the screen so I can
position a popup window near it. I can get the window position by:

        window1.GetPosition(out x, out y);

but when I try to use comboboxentry1.Allocation.X to get the relative
position within thw window, I get the following error:

 "Object reference not set to an instance of an object"

So my question is, How can I get the relative position of a comboboxentry in
a window?

Thanks,
Kim
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