Greetings, Monks

I have code simplified as:

$Win=Win32::GUI::Window->new( <blah>);
$tv=$Win->AddTreeView(
 -onClick=> \&onClick_TreeView,
 -onDblClick => \&onDblClick_TreeView,
 -onRightClick => \&onRightClick,
<blah>
);
[download]

The problem is that Windows, being what it is, always calls the single click function.
According to Microsoft^*, the single-click callback must wait 'DoubleClickTimeout' to see if the double-click callback set a global variable

Ok...
Tests show that if onClick_TreeView returns immediately, the onDblClick_TreeView gets called.

But
If I make onClick_TreeView wait 'DoubleClickTimeout' ms for that global variable, the Double-Click callback never happens.
Pretty sure its because it's all single-threaded.

Is there a clean solution?
Ideally I'd like to have just missed a -DontBeAnArseAboutDblClick common property,
But failing that, any best practice or common workarounds?
The solution recommended by Microsoft is to have the single-click callback set a timer to wait for a 2^nd click, or honour the single
Isn't that the OS's JOB?

Anyway,
Thanks.

* https://docs.microsoft.com/en-us/dotnet/desktop/winforms/input-mouse/how-to-distinguish-between-clicks-and-double-clicks?view=netdesktop-5.0