How to format custom TreeItems with images?

I have a GWT Tree that contains custom TreeItems that consist of a
leading image (ImageResource), then some text, and followed with
another optional image. The later image is a URL not an ImageResource
because the contents are dynamic at runtime.

Currently I'm building some custom SafeHtml just appending three
SafeHtml's together. I use ImageResourceRenderer for the first image,
then SimpleSafeHtmlRenderer for the text, and then Template for the
URL image.

However the results are not good. The first image is top aligned
instead of centered with the text and the selection rectangle. (I
haven't even gotten to testing with the trailing image yet.)

I do have my custom HTML wrapped in a span with custom class name so I
can configure with CSS but I have a feeling I'm not doing this the
right way.

How can I have better control over the vertical alignment of things?
Specifically the ImageResource needs to be centered.

-Dave

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