Ability to switch sides through one button click

Hi, I would like the ability to change player sides through one button click. For example in my game say I have six sides (Black, Blue, Green, Red, White, and Yellow). I would like to have six buttons on the toolbar colored those respective colors. Then if a player presses one of those buttons it would switch the current player to that side. It would then allow only one button click as opposed to the four i.e. pressing the retire button, selecting join another side, using the drop down box to choose the side, and then pressing the OK button?

I am assuming the dialogue for this would list the following entries:
A drop down box or entry box to enter the side that will become the active player if the key command is executed.
The key command to execute the switching of sides.
A message to display if the switching of sides occurs.