Changing Colour of Button results in cannot dispatch; dispatcher is nil

[theAkito]

  button_switchMode.onClick = proc(event: ClickEvent) = bMode = if bMode == ENCODE:
      button_switchMode.canvas.areaColor = rgb(255, 0, 0)
      button_switchMode.text = $DECODE
      DECODE
    else:
      button_switchMode.canvas.areaColor = rgb(0, 255, 0)
      button_switchMode.text = $ENCODE
      ENCODE

When this onClick event gets triggered, my app is getting the following error.

Error: unhandled exception: cannot dispatch; dispatcher is nil

When trying to research this issue, there were hints pointing at it being a problem with incorrect method implementations or at least related to objects.

[simonkrauter]

Currently buttons don't support a custom background color or custom drawing through a canvas. As far as I know there is no easy way to implement this.

[theAkito]

Currently buttons don't support a custom background color or custom drawing through a canvas. As far as I know there is no easy way to implement this.

What about this?

NiGui/examples/example_30_custom_button.nim

Line 12 in 03f7db2

canvas.areaColor = rgb(55, 55, 55)

[simonkrauter]

Oh right. What I said above only applies for a native button. You can use your own button based on the type Button. Then your code is responsible for drawing the widget.