I was actually planning on implementing this to my StartButton Stat Bar as well.
If the DynamicData isn't working, you could simple just work backwards up the tree to the root, and then down to the (Today) element in the Welcome window.
You could either just set your text on button press, or also modify the Text element in the Welcome with an "OnTextChanged" to further update your custom element when the text changes.
Cheers.
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