Ok, this is pretty specific...
The objective is to use a TemplateBox to format something that is programatically inserted with NotebookWrite. That thing which is inserted is some dynamic control, an OpenerBox.
So, for example:
(*Pause[3];*)NotebookWrite[InputNotebook[],
TemplateBox[{Dynamic[x]}, "blah",
DisplayFunction :> (OpenerBox[#] &)]]
Uncomment the Pause[3] to try it. Run it and select something in another input cell.
The problem is, in this example, that the OpenerBoxdoesn't open/close, or not until you convert the cell to cell expression and back to normal doing nothing, or until you cut and paste the OpenerBox, or until you write something in the cell expression, etc... Point is, the cell expression is perfect but it doesn't work until you slap the FE a little bit...
What's going on? How can I use a TemplateBox that gets pasted programatically to control some dynamic variable?