[ColorPicker] popup with color selecting falls under the stage and live there.

See attached movie. I open window with selecting color and then click on stage. It falls under that stage. If I click add color, it doesn't appear (but it could go to front; or it could be closed on focus loss), and that looks not good, because I should go and look for it under the stage. Also, If i close parent stage, window with colors selecting continues its own life.