Bad modeless dialog default button rendering

There are issues with the modeless dialog default button rendering when the dialog loses focus as visible in the following image where the default button in the first one.
 

 
I created a sample application that opens both a "standard" dialog and a tool dialog, here is the issue in a screenshot
 

 
 
The standard dialog is behind the main application, while the tool dialog default button is not properly rendered when the tool dialog loses focus.