Colour selection bug

[d-danger]

There is a minor usability bug. After submitting the image to the generator, when you click the hexadecimal colour input in the "Windows Metro" section it loads a colour picker. If you then click on the image to the left it loads the colour for the pixel you have clicked (a very nice feature) but when you click a second time anywhere else it then reverts back to what was originally set by the colour picker, despite this having disappeared from view.

Tested in FF and Chrome.