How to find the currently used theme color of a themed control

[Fudley 5]

A number of controls are not themed, like TRectangle, TLine  and the svg.overridecolor on TkSvg. I would like to set these to match the current theme.

 

How can I find the currently used theme color of a control I know is themed,  so I can then apply it to the non-themed controls at runtime?

 

For instance 

• TLabel themed fontcolor would do nicely to use for svg.overridecolor on TkSvg,.
• TLabel themed fontcolor would work (for me) for TRectangle.stroke
• TButtons themed fill color could be used for TRectangle.fill

 

For me, this would save oodles of work.

 

thanks all