IE9 contentDocument problem

[notabene]

Using IE9 and (force) FLASH:

getElementById("XXX").contentDocument
Expected return value: _Node
returns flash object (IShockwaveFlash)

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More details:
SVG-file is apparently loaded correct using:
window.svgweb.appendChild(obj, container);

svg.htc is not loaded in IE9?
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Any ideas are appreciated!

[notabene]

Only solution I could figure is forcing browser into IE8 mode:

<meta http-equiv="X-UA-Compatible" content="IE=8" />

[notabene]

IE9 in IE8 mode

<meta http-equiv="X-UA-Compatible" content="IE=8" />

<meta name="svg.render.forceflash" content="true">

Presents a new problem / error:

Error: xml5645: the specified entity has not been declared

Eg. svgweb/tests/browser-tests/issue-tests/issue564.html?svg.render.forceflash=true