Is there a trick to paint and to see immediately on the 3D view in texture mode?
And do not mean paint on the 3D object, but on the 2D canvas.
Now you need to save your image and refresh the 3D window.
It amazes me how capable Blender is.
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Note to my self; Yes, it can be done 
sometimes, you have questions, which will be fulfilled after a couple of lessons.