The window title bar color is a system-wide setting, it applies to all programs running on the computer.

The only way around it would be to set the titlebar property to false and create a titlebar replacement control. It would need to support dragging the window and have at least a close button in the upper right.

Hi.

First of all, in screenshot you provided you included also menu with titlebar. This is wrong, as those are two different objects.

Themes may be a solution to that question. But it may not be what you want.

If you want more information about themes, look at the following links:

New UI theme - - What's New (appeon.com)

Enhanced UI Theme - - What's New (appeon.com)

For window object you do have the following declaration in theme.json that is related to title:

"title":
{
	"active-state":
	{
		"background-color":"#FFFFFF",
		"text-font":{"color":"#000000"}
	},
	"inactive-state":
	{
		"background-color":"#FFFFFF",
		"text-font":{"color":"#999999"}
	}
},

Background color is what needs to be modified.

But this would affect all windows. To make it affect only the frame you should disable all other controls and add a section for the specific object you open as frame:

  "w_your_frame_control": // here you should add all the code from window and modify title...
 {
   ...
   //Copy the settings from the "window" node
   //of the "theme.json" file and then modify.
 }

Setting "drawing":false to all other controls will disable them... But for your frame you should be able to customize all available parts in json file.

Andreas.