problem of docklayoutpanel in IE9

our colleague just found that in IE9, the following is not work:

DockLayoutPanel dockLayoutPanel = new DockLayoutPanel(Unit.PX);
dockLayoutPanel.setSize("1024", "768");

the dockLayoutPanel will not shown (although it works in IE8).

In IE9, we must write the px in setsize

DockLayoutPanel dockLayoutPanel = new DockLayoutPanel(Unit.PX);
dockLayoutPanel.setSize("1024px", "768px");

why this is the case?

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