wxColourDialog, set position on screen (Windows)?

Using wx 3.3.1 on Windows.

I'm having a lot of trouble setting the position of the 
standard wxColourDialog on Windows.

Even with very simple code, the dialog always appears top left.

wxColourData data;
data.SetColour(*pDefaultColour);
wxColourDialog dlg1(pParent, &data);
dlg1.Move(500, 500);
dlg1.ShowModal();

Is there a knack to getting this to work?

Thanks in advance,

Tony.

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